launchpad: row 200 packet, N2 guard kept and mutant 12 ruling (sage-1446)

stack-release: round 2, slot and proof checks resolve REPO, config_checks refuses a config that doesn't parse (row 200, #1698 , sage-1432)
launchpad: row 200 packet, webby-0028 notes N1-N4 (#1698 )
2026-10-20 15:29:41 -05:00 · 2026-10-20 15:25:04 -05:00 · 2026-10-20 15:16:08 -05:00 · 2026-10-20 15:09:17 -05:00 · 2026-10-20 15:08:19 -05:00 · 2026-10-20 14:57:55 -05:00
71 changed files with 4606 additions and 3137 deletions
@@ -16,6 +16,15 @@ not fleet seats. Keep changes in `/mnt/storage/src/mosaic-stack`; do not modify
 | Rocko | General development, investigation, testing, and review | T3 session (Codex, gpt-6.1-sol, thread d99326cc, lead decision 122; Claude thread b84bb264 retired 2026-10-12); launcher Claude Code, Sonnet model | `agents/rocko/launch.sh` |
 | Filbert | General development, investigation, testing, and review | T3 session (Claude, Opus 5.5, thread 048f3c63, non-sandbox reviews only, lead decisions 130 and 134; Codex threads f712d8af and 50342f6a retired 2026-10-13, Claude thread 9cb9731e retired 2026-10-12); launcher Pi, `openai-codex/gpt-6-astra:low`, not to be used under R26 until it changes (lead decision 69) | `agents/filbert/launch.sh` |
 | Researcher | Source-grounded technical research and evidence | T3 session (Claude, Sonnet 5.5, thread 9bac0794, rows 97 and 98, lead decision 124); Haiku rows (71, 80, 84, 88, later 96) run as subagents Sage dispatches with model haiku, effort high and a worktree (lead decision 129); Haiku thread c98aaf4a retired 2026-10-13 unused; launcher Pi, configured Mosaic model | `agents/researcher/launch.sh` |
+| Launchpad | Builder, MVP T1 row 192 (Q175 SSO phase 1) | T3 session (Claude, Opus 5.5), started by Sage under mos-0974/0977 | none, T3 only |
+| Morgana | Builder, MVP T1 row 193 (human users and RBAC) | T3 session (Claude, Opus 5.5), started by Sage under mos-0974/0977 | none, T3 only |
+| Honker | Builder, MVP T1 row 194 (agent lifecycle) | T3 session (Claude, Opus 5.5), started by Sage under mos-0974/0977 | none, T3 only |
+| Gander | Builder, the human boundary across uids (P19 333, #1694) | T3 session (Codex, gpt-6.1-sol), started by Sage under mos-0977 | none, T3 only |
+| Herb | Builder, a second gate lane (#1695) | T3 session (Codex, gpt-6.1-sol), started by Sage under mos-0977 | none, T3 only |
+| Bushroot | Builder, retire the control board writer on 7331 (#1696) | T3 session (Claude, claude-haiku-5-5), started by Sage under mos-1008 | none, T3 only |
+| Megavolt | Builder, MVP T1 item 6 (agent credentials and git identity, #1697) | T3 session (Claude, Opus 5.5), started by Sage under mos-0974/0977 | none, T3 only |
+| Webby | Reviewer: Case 2 designs, rows 192 and 194 | T3 session (Claude, Opus 5.5, thread 03086006), started by Mos (mos-0981) | none, T3 only |
+| Duckworth | Reviewer: federation designs, row 193 | T3 session (Claude, Opus 5.5, thread ffceafec), started by Mos (mos-0977) | none, T3 only |
 | Sage | Project lead: coordination, review, integration; earlier DYOR strategy records retained | T3 session (Claude Code); Pi launcher `zai/glm-5.3:high` retained | `agents/sage/launch.sh` |

 Each script supports `--check` and `--fresh`. Normal launches resume the agent's
@@ -0,0 +1,8 @@
+# Bushroot
+
+Builder seat, Claude Haiku 5.5, started by Sage under mos-1008 item 2 (a low-level model under Q177) for the row
+that retires the control board writer on 7331 (#1696).
+
+No launcher in this directory. The seat runs as a T3 thread and works in its own worktree. It has no
+credentials of its own; until the credentials row settles per-agent identity, it pushes only its own `bushroot/*`
+branches through the repository credential helper (mos-0981), never `refactor`, `main` or another seat's branch.
@@ -0,0 +1,7 @@
+# Duckworth
+
+Reviewer seat, Claude Opus 5.5, started by Mos (mos-0977, thread ffceafec). Reviews federation designs and MVP T1 row 193.
+
+No launcher in this directory. The seat runs as a T3 thread and works in its own worktree. It has no
+credentials of its own; until the credentials row settles per-agent identity, it pushes only its own `duckworth/*` branches
+through the repository credential helper (mos-0981), never `refactor`, `main` or another seat's branch.
@@ -0,0 +1,8 @@
+# Gander
+
+Builder seat, Codex gpt-6.1-sol, started by Sage under mos-0977 item 5 (more Codex Sol rows) for the human
+boundary row (P19 333, #1694, mos-0989).
+
+No launcher in this directory. The seat runs as a T3 thread and works in its own worktree. It has no
+credentials of its own; until the credentials row settles per-agent identity, it pushes only its own `gander/*`
+branches through the repository credential helper (mos-0981), never `refactor`, `main` or another seat's branch.
@@ -1,11 +0,0 @@
-# Gosalyn
-
-Worker seat for Mosaic Stack, MVP track T2 (Case 2, the creative writing hub, Vikunja #416).
-
- T3 thread: 7604438a-0ded-41c8-bd3f-26f57fdb5cd2
- Model: Opus 5.5 (Claude Code, T3)
- Launched by Mos (Jason's main agent, T3 38bc4c81-6270-4021-b00c-6a15c43b9b0e), who briefs the seat
- Repository lead and queue: Sage (T3 1ef1e4f8-3ead-4208-beca-38f9f1add079)
- Branch: gosalyn/case2-design, pushed only by this seat, landed on refactor by Sage
-
-Work lives in `work/`. The Case 2 design is `work/case2/DESIGN.md`.
@@ -1,33 +0,0 @@
-# Row 282, PRD 1.15 gate
-
-Candidate 6b5b0681933689511974d18176fab6f13517583c on 94c33a43c. Webby approve rev 3308, comment 30764.
-Gate CLEAR sage-2945, refactor at 86a665bdf.
-
-## Readers, by grep at 86a665bdf
-
-`git grep -ln "mosaic-stack.md\|requirements.json" 86a665bdf -- 'packages/*/tests/*' 'scripts/test-*.sh'`:
- packages/bus/tests/requirements.test.mjs (imports src/broker.mjs and builds a Broker)
- packages/tasks/tests/requirements.test.mjs (reads the PRD and the list, holds the version pin)
- packages/tasks/tests/verbs.test.mjs (loadRequirements)
- packages/cli/tests/stack-copy.test.mjs (checks the file exists in a copy, not its text)
-
-Shell suites: `git grep -n "mosaic-stack\.md\|requirements\.json\|docs/prd" 86a665bdf -- 'scripts/test-*.sh'`
-gives no hit, rc=1. Positive control `git grep -ln "docs/" 86a665bdf -- 'scripts/test-*.sh'` hits
-scripts/test-conductor.sh and scripts/test-queue.sh, so the grep works. No shell suite is in the gate.
-
-## Drift 94c33a43c..86a665bdf
-
-13 paths, none in the manifest. packages/bus/src/broker.mjs (+16/-13, row 269) is read by
-bus/tests/requirements.test.mjs, so the gate shape went to Sage in gosalyn-0191.
-
-## Run
-
-The three node files, whole, in one `node --test` under `timeout -k 10 300`. The last run took a few
-seconds, so 300 s is far over three times that. pipefail, TMPDIR /mnt/storage/scratch/tmp/gIaU, busy check first, grep ^skip.
-
-## Result (sage-2949 option b, sage-2952 pid exclusions 3657625 and 335722)
-
-Trial /mnt/storage/scratch/tmp/gIaU/trial, detached at 86a665bdf with the three manifest files from
-6b5b06819 (blobs 717c66fce, a079888e0, 759b011fc). write-tree 4f30ed10ad2f35a4ecb573ae70f831507cb0d858,
-unchanged after the run. Busy check CLEAR. 19:06:27Z to 19:06:29Z: tests 37, pass 37, fail 0,
-cancelled 0, skipped 0, todo 0, RC=0. No ^skip line. refactor still 86a665bdf at 19:06:36Z.
@@ -0,0 +1,8 @@
+# Herb
+
+Builder seat, Codex gpt-6.1-sol, started by Sage under mos-0977 item 5 (more Codex Sol rows) for a second gate lane
+design row (#1695, mos-0977 item 6).
+
+No launcher in this directory. The seat runs as a T3 thread and works in its own worktree. It has no
+credentials of its own; until the credentials row settles per-agent identity, it pushes only its own `herb/*`
+branches through the repository credential helper (mos-0981), never `refactor`, `main` or another seat's branch.
@@ -0,0 +1,7 @@
+# Honker
+
+Builder seat, Claude Opus 5.5, started by Sage for MVP T1 row 194 (agent lifecycle, #1692) under mos-0974 and mos-0977.
+
+No launcher in this directory. The seat runs as a T3 thread and works in its own worktree. It has no
+credentials of its own; until the credentials row settles per-agent identity, it pushes only its own `honker/*` branches
+through the repository credential helper (mos-0981), never `refactor`, `main` or another seat's branch.
@@ -0,0 +1,7 @@
+# Launchpad
+
+Builder seat, Claude Opus 5.5, started by Sage for MVP T1 row 192 (Q175 SSO phase 1, #1690) under mos-0974 and mos-0977.
+
+No launcher in this directory. The seat runs as a T3 thread and works in its own worktree. It has no
+credentials of its own; until the credentials row settles per-agent identity, it pushes only its own `launchpad/*` branches
+through the repository credential helper (mos-0981), never `refactor`, `main` or another seat's branch.
@@ -0,0 +1,177 @@
+# Row 192: Q175 phase 1, the Console verifies sign-in itself (`--sso`)
+
+Launchpad, 2026-10-20. Author Launchpad, reviewer Webby, gate owner Sage. Issue #1690. Brief
+`docs/plans/2026-10-20_sso-phase1.md`. Design `agents/sage/work/q175-sso/DESIGN.md` (blob 9e3eadb15c80).
+Rulings sage-1340 (F1 to F6) and sage-1347 (F7, F8). Plan launchpad-0001.
+
+Base 53bb59462 (`base.txt`). Candidate: branch `launchpad/row192`, r1 83b32d8d8 and the round 2 commit on it.
+`candidate-manifest.sha256` lists the 18 changed code, test and doc paths; the packet files are not in it. Drift
+check at the r2 commit: `git log 53bb59462..origin/refactor` (origin/refactor ae3c36f24) touches none of the 18 paths.
+
+No request in any test goes to auth.diversecanvas.com, mosaic.woltje.com or 127.0.0.1:7332. Every provider
+is the fake OP in `tests/helpers/fake-oidc.mjs`: https on 127.0.0.1 with a throwaway self-signed certificate,
+and a fetch that refuses any other origin. The public Host in the tests is `console.example.test`, sent as a
+header to the test's own loopback listener. No test reads or writes `~/.mosaic-dev`, `~/.config/mosaic-dev`,
+`~/.mosaic`, a slot file outside its temp dir, or a live unit.
+
+## Files
+
+| Path | Change |
+| --- | --- |
+| `package.json`, `package-lock.json` | `oauth4webapi` 3.8.8, exact, at the root (design: the copy runs `npm ci` there). No other dependency. |
+| `scripts/mosaic-config.mjs` | Accepts an optional `console.sso` key and checks it with `checkConsole`. Without the key, output is byte-identical (F2). |
+| `scripts/test-config.sh` | Test 25: a good `console.sso` passes; each refusal class refuses. 31/31. |
+| `packages/webui/src/sso-config.mjs` (new) | `checkConsole`: shape, `publicOrigin`, 1 to 8 providers, issuer https with a trailing slash, slot names, `ALGS` (asymmetric only), 1 to 64 subjects. |
+| `packages/webui/src/sso.mjs` (new) | The relying party: `readSlot`, discovery and JWKS with retry, `/auth/login`, `/auth/callback`, `/auth/logout`, sessions, `health()`, `summary()`, `formTargets()`. |
+| `packages/webui/src/serve.mjs` | Under `sso`: public Host only on the human listener (F4), `/auth/*` routes, session check before every page and API route, CSP `form-action` adds the end-session origins, tester listener refusals (F8). |
+| `packages/webui/src/cli.mjs` | `--sso`, its refusals, slot reads, the start lines, `close()` on stop. |
+| `packages/webui/src/chat-http.mjs` | Under `--sso` the session check already ran, so the header-user check is skipped; the Origin check uses `publicOrigin`. |
+| `packages/webui/src/public/app.js`, `bus.js`, `index.html` | 401 `sign-in required` signs the page out with a link to `/auth/login?return=...` (design test 24, F1). The Sign out form shows only when `/api/config` says `sso` (F7). |
+| `scripts/webui-service.sh` | Passes `--sso` through; `--send` refusal text names `--sso`. |
+| `packages/webui/tests/service.test.mjs` | The `--send` refusal regex follows the new text. |
+| `packages/webui/README.md` | New section "Sign-in in the Console (Q175 phase 1, #1690)". |
+| `packages/webui/tests/helpers/fake-oidc.mjs` (new) | The fake OP. |
+| `packages/webui/tests/sso.test.mjs` (new) | 28 tests: three positives and design tests 1 to 23 (some split in parts). |
+| `packages/webui/tests/sso-browser.test.mjs` (new) | 2 tests: design test 24 with F1, and F7. |
+
+## Tests run (single files, this worktree, final tree)
+
+| File | Pass | Fail |
+| --- | --- | --- |
+| sso | 28 | 0 |
+| sso-browser | 2 | 0 |
+| pinned-copy | 10 | 0 |
+| serve | 4 | 0 |
+| preview | 11 | 0 |
+| proof | 4 | 0 |
+| proof-cli | 3 | 0 |
+| send | 13 | 0 |
+| service | 31 | 0 |
+| tester-listener | 10 | 0 |
+| tester-cli | 2 | 0 |
+| board-held | 3 | 0 |
+| send-browser | 2 | 0 |
+| docs-browser | 1 | 0 |
+| chat | 23 | 0 |
+| chat-browser | 11 | 0 |
+| bus-browser | 2 | 0 |
+| settings-write | 4 | 0 |
+| project-file | 10 | 0 |
+| instances | 5 | 0 |
+| routes | 5 | 0 |
+| `scripts/test-config.sh` | 31 | 0 |
+
+The first singles pass failed `pinned-copy` 1 of 10: `ERR_MODULE_NOT_FOUND: Cannot find package
+'oauth4webapi'` from a copy's `sso.mjs`. The test's fixture repo writes an empty package.json and lock, so the
+copy's `npm ci` installs nothing, and `sso.mjs` imported oauth4webapi at module load. `cli.mjs` imports
+`sso.mjs` on every start, so plain `serve` broke. Fix: `sso.mjs` loads oauth4webapi inside `createSso`
+(`oauth ??= await import('oauth4webapi')`). A Console without `--sso` never resolves the package. A real copy
+still has it from the root lock. Mutant 21 restores the static import and `pinned-copy` kills it. After the
+fix: pinned-copy, sso, sso-browser and serve rerun green (counts above).
+
+Not run by me (slot work, busy at the time): the full webui package suite, the cli suite, and
+`scripts/test-*.sh` other than test-config. `packages/cli/tests/stack-copy.test.mjs` and
+`stack-release.test.mjs` also build copies with an empty lock and are the ones to watch for the same
+failure. They need Sage's gate.
+
+## Mutants (`mutants.py`, run as `python3 mutants.py <tree> [N ...]`)
+
+Each mutant edits one source file, runs one test file filtered to one test name, and restores the file
+checked by sha256. Final run on the final tree: `/mnt/storage/scratch/launchpad-r192/mutants-final.log`.
+
+| # | Mutant | Test | Result |
+| --- | --- | --- | --- |
+| 1 | drop validateApplicationLevelSignature | sso 9 | KILLED |
+| 2 | wrap the signature call in a continuing try/catch | sso 9 | KILLED |
+| 3 | drop the subjects check | sso 10 | KILLED |
+| 4 | accept HS256 and none in ALGS | sso 11 start | KILLED |
+| 5 | take the provider from the query | sso 15 | KILLED |
+| 6 | tester listener reads sign-in cookies (F8) | sso 12 | KILLED |
+| 7 | tester listener takes Authorization (F8) | sso 12 | KILLED |
+| 8 | tester listener takes x-authentik-* (F8) | sso 12 | KILLED |
+| 9 | skip the login record delete | sso 7 | KILLED |
+| 10 | drop HttpOnly from the session cookie | sso 20 and 21 | KILLED |
+| 11 | refresh last-seen on every request | sso 13 idle | KILLED |
+| 12 | build redirect_uri from the request Host | sso 22 | KILLED |
+| 13 | serve the loopback read path under --sso (F4) | sso 22 | KILLED |
+| 14 | bus.js fetchRead ignores 401 sign-in required (F1) | sso-browser 1 | KILLED |
+| 15 | bus.js fetchApi ignores 401 sign-in required (F1) | sso-browser 1 | KILLED |
+| 16 | app.js getJSON ignores 401 sign-in required | sso-browser 1 | KILLED |
+| 17 | app.js api() ignores 401 sign-in required | sso-browser 1 | KILLED |
+| 18 | signInRequired takes any 401 | sso-browser 1 | KILLED |
+| 19 | Sign out shown without the sso condition (F7) | sso-browser 2 | KILLED |
+| 20 | CSP form-action without the end-session origins | sso 13 CSP | KILLED |
+| 21 | import oauth4webapi at module load | pinned-copy | KILLED |
+| 22 | restore the r1 relative returnPath (round 2, B1) | sso 14 | KILLED |
+| 23 | drop the second origin check (round 2, sage-1403) | sso 14 | SURVIVED, equivalent (see Round 2) |
+
+Mutant 16 survived its first run: test 1 had no `getJSON` path. The History click on
+`/api/conversations` was added and it is now killed.
+
+## Deviations from the design
+
+- **F1 (sage-1340).** `bus.js` `fetchRead` and `fetchApi` apply the same 401 `sign-in required` rule as
+  `app.js`, even when `/api/config` has no `sso`. Tested in sso-browser 1, mutants 14 and 15.
+- **F7 (sage-1347).** A Sign out form (`POST /auth/logout`) in the command bar, hidden unless `/api/config`
+  says `sso`. Tested in sso-browser 2, mutant 19.
+
+- **Proof header on 7333 under `--sso` (webby-0019 N2).** `cli.mjs` passes `testerProofHeader: null` under
+  `--sso`, since `--sso` refuses the proof pair and there is no header name to refuse. A request to 7333 that
+  still carries the old proof header is not refused for it. It gains nothing: under `--sso` no listener
+  reads a proof header (`proof` is null in `startServer`). Left as is.
+
+## Assumptions and choices
+
+- **F8 (sage-1347).** Under `--sso` the tester listener refuses a request carrying `Authorization`, either
+  `__Host-mosaic` cookie or any `x-authentik-*` header, case-insensitive (Node lower-cases header names).
+  sso 12 sends one of each; mutants 6 to 8.
+- **oauth4webapi loads lazily** inside `createSso` (see the pinned-copy failure above).
+- **Client authentication** is `ClientSecretBasic`; the fake OP's token endpoint checks Basic auth.
+- **Caps**: 1 to 8 providers, 1 to 64 subjects per provider, 64 sessions, 32 pending logins. The 33rd login
+  drops the oldest record (sso 17).
+- **CSP**: under `--sso`, `form-action` adds each provider's end-session origin. Chrome applies
+  `form-action` to the redirect after the Sign out POST, so without it the logout stops at the Console.
+  Tested in sso 13 CSP, mutant 20. Without `--sso` the CSP string is unchanged.
+- **`--send` refusal text** in cli.mjs and webui-service.sh now ends "or --sso".
+- **Start lines**: one `Sign-in provider:` line per provider with id, issuer, subject count and state
+  (`ready`, `refused` or `unreachable`). No client id, secret or sub.
+- **Test 1** uses `console.example.test` as the public Host, not mosaic.woltje.com (no request goes there).
+- **Test 11 slot files**: the owner check is not tested; the test can't create a file owned by another uid
+  without privilege. Symlink, 0644, 0640 and a file under the repository are tested.
+- **Test 23** covers a provider down at start: the Console starts, `/auth/login` is 503, loopback `/healthz`
+  is 200 with `sso: { a: 'unreachable' }`, one `discovery-failed` line, and the retry makes sign-in work. An
+  HS-only discovery at start refuses the start (in test 23 and in test 11 start).
+- **Test 22**: a Host of bare `localhost` without a port is not in the table. It hits the older
+  `non-local Host refused` check before the sso check; a comment in the test says so.
+
+## Round 2 (webby-0019)
+
+- **B1, open redirect after sign-in.** `returnPath` took any URL on `publicOrigin`, and dot segments can
+  normalize to a pathname of `//evil.example`, which a browser reads as scheme-relative in a relative
+  Location. Fix per sage-1403: `returnURL` (renamed) builds an absolute URL, `publicOrigin + pathname +
+  search`, checks its origin again, and returns its href. Anything else is `publicOrigin/`. The callback's
+  Location is now always absolute on the Console. Test 14 asserts the exact Location and its origin for each
+  case. It adds Webby's three rows (`/.//evil.example`, `/x/..//evil.example`,
+  `https://console.example.test//evil.example`), each now `https://console.example.test//evil.example`, a path
+  on the Console. It also adds `/board/./x`, which lands on `/board/x`. The positive test expects
+  `https://console.example.test/board?x=1`.
+- **Mutant 22** restores the r1 relative `returnPath`; test 14 kills it.
+- **Mutant 23** drops the second origin check. It SURVIVES, and I read it as equivalent: `checkConsole`
+  holds `publicOrigin` to a bare https origin, and a parsed https pathname always starts with `/`, so
+  `publicOrigin + pathname` can't parse to another origin. The check stays because sage-1403 asks for it.
+  Either the check goes, or it stays as a guard no test can reach. That is Sage's call.
+- **N1.** The design cite is now blob 9e3eadb15c80 (`git rev-parse 83b32d8d8:agents/sage/work/q175-sso/DESIGN.md`).
+- **N2.** Listed under Deviations.
+- **N3.** `SIGN_IN_COOKIE` has its own comment, above the row 177 comment and `TESTER_CHAT_WRITE`.
+- **N4.** Row 200 (#1698) covers it: `stack-release.sh` refuses `config-console-key` before any stop when the
+  target's loader refuses the key, on activate and rollback.
+- **N5.** No change.
+
+Round 2 runs, this worktree, final tree: `sso.test.mjs` 28/28 (`/mnt/storage/scratch/launchpad-r192/sso-r2.log`);
+mutants 22 and 23 (`/mnt/storage/scratch/launchpad-r192/mutants-r2.log`).
+
+## Not done here
+
+- Row 200 (#1698, `stack-release.sh activate --sso`) is chained on this candidate and starts only after the
+  manifest is with Webby (sage-1369).
+- Full suites are for Sage's gate.
@@ -0,0 +1 @@
+53bb59462120a03a9f54b02881895e3f575e501c
@@ -0,0 +1,18 @@
+95d9a48812eebc415e3605239788e5b0746f1457a3bf0f9b9651a8c745e8b0f6  package.json
+390cbb0ef88de6cbc6d8f43b9e212abfdf0ef0e1c88fa02f5ab790caabc53eed  package-lock.json
+726b71bcfdb4d9409cefc86bed2fbe8e678c6efb50bcf5bb22344aeda1eee201  packages/webui/README.md
+f7b6b68906f13a644854b8083287dfa2936e8defc6207d05739e89763cc91440  packages/webui/src/chat-http.mjs
+4a2d226bdbfee98b180103f71b3cb8122303cfac4aeece42bd30ce167ba6ff55  packages/webui/src/cli.mjs
+41ee8798c34ee491b80ae1b42c3e96cd5d12fb1603b1ab88ac2dd10b5fb27964  packages/webui/src/public/app.js
+e6c8f838eb7cdc2ae556c04451ca4c8f2d433117a17f285a144cfc7dff03e2a4  packages/webui/src/public/bus.js
+f276fa440ec938638cb3e0f1b812fafa929460a6b96f1dab4cf1076a7c0c18ea  packages/webui/src/public/index.html
+333d474b1c7e753938aedc639c08f9db0e787faf56aa8068d013fd304a0b3b7e  packages/webui/src/serve.mjs
+37b01ab0479d5f2a7ab9aac790931c6d88c790465392d9c0b65a105513f3e36b  packages/webui/src/sso-config.mjs
+b624f044d361c648cefa161abe5f2b96e0cd8a83bc7816c9d501a2cd840988ca  packages/webui/src/sso.mjs
+84e31d4beba0de5ed6d192921bd7b016296c8b2a42b3fcf1176663e182320d9e  packages/webui/tests/helpers/fake-oidc.mjs
+ac01037743fcbf1efa641794d3878f113b6206033d2f66cde072a52ccfae1a51  packages/webui/tests/service.test.mjs
+9358e3755e174b61532e2c528e733ffcdb48941cbadb825f1b0254bc55d1920e  packages/webui/tests/sso-browser.test.mjs
+3f8527fd7ae1ffb2bffce3450971f125bd616954b534577ef54249c87f36e248  packages/webui/tests/sso.test.mjs
+f8307d4bd998634467fbed8748157754132b76affac051f320196161ce385e4a  scripts/mosaic-config.mjs
+3301c1fabf616bb961d62f6decd0a46dadb0f399b8ba7f3c2ca60023d2b24c78  scripts/test-config.sh
+7678bb6b45861c3dc6d775fc99269b1db7350ced60b89517d6ebeb4cc161781c  scripts/webui-service.sh
@@ -0,0 +1,59 @@
+# Row 192 (#1690) mutants: `python3 mutants.py <tree> [N ...]`. Each applies to the tree's source, runs one
+# test file (optionally one name pattern) and restores the file from a saved copy, checked by sha256.
+# Killed = test exit != 0.
+import hashlib, os, subprocess, sys, signal
+W = os.path.join(os.path.abspath(sys.argv[1]), 'packages', 'webui')
+if not os.path.isfile(os.path.join(W, 'src', 'sso.mjs')): sys.exit(f'ABORT no packages/webui/src/sso.mjs under {sys.argv[1]}')
+S, B, C, F = 'src/sso.mjs', 'src/serve.mjs', 'src/sso-config.mjs', 'src/public/'
+T, P = 'tests/sso.test.mjs', 'tests/sso-browser.test.mjs'
+M = [
+ ('drop validateApplicationLevelSignature (9b)', S, [("try { await oauth.validateApplicationLevelSignature(entry.as, response, options()); } catch (err) {", "try { } catch (err) {")], T, '^9:'),
+ ('wrap the signature call in a continuing try/catch (9b)', S, [("try { await oauth.validateApplicationLevelSignature(entry.as, response, options()); } catch (err) {", "try { try { await oauth.validateApplicationLevelSignature(entry.as, response, options()); } catch {} } catch (err) {")], T, '^9:'),
+ ('drop the subjects check (10)', S, [("if (name === undefined) {", "if (false) {")], T, '^10:'),
+ ('accept HS* in algs (11)', C, [("export const ALGS = Object.freeze(['PS256',", "export const ALGS = Object.freeze(['HS256', 'none', 'PS256',")], T, '^11: start'),
+ ('take the provider from the query (15)', S, [("const entry = record && providers.get(record.provider);", "const entry = record && providers.get(query.get('provider') ?? record.provider);")], T, '^15:'),
+ ('let the tester listener read cookies (12, F8)', B, [("SIGN_IN_COOKIE.test(req.headers.cookie ?? '') ||", "")], T, '^12:'),
+ ('tester listener takes Authorization (12, F8)', B, [("Object.hasOwn(req.headers, 'authorization') ||", "")], T, '^12:'),
+ ('tester listener takes x-authentik-* (12, F8)', B, [(" || Object.keys(req.headers).some(h => h.startsWith('x-authentik-'))", "")], T, '^12:'),
+ ('skip the login record delete (7)', S, [("if (key !== null) logins.delete(key);\n    // The provider", "// The provider")], T, '^7:'),
+ ('drop HttpOnly from the session cookie (21)', S, [("`${SESSION_COOKIE}=${id}; ${ATTRS}`", "`${SESSION_COOKIE}=${id}; Path=/; Secure; SameSite=Lax`")], T, '^20 and 21'),
+ ('refresh seen on every request (13)', B, [("sso.session(req, { touch: req.method === 'POST' || (req.method === 'GET' && !path.startsWith('/api/')) })", "sso.session(req, { touch: true })")], T, '^13: idle'),
+ ('build redirect_uri from the request Host (22)', S, [("const redirectUri = `${publicOrigin}/auth/callback`;", "let redirectUri = `${publicOrigin}/auth/callback`;"), ("    const query = new URLSearchParams(search);\n", "    const query = new URLSearchParams(search);\n    redirectUri = `https://${req.headers.host}/auth/callback`;\n")], T, '^22:'),
+ ('serve the loopback read path under --sso (22)', B, [("if (sso !== null && !named && !(path === '/healthz' && req.method === 'GET')) return json(res, 403, { error: 'public Host required' });", "")], T, '^22:'),
+ ('bus.js fetchRead ignores 401 sign-in required (F1)', F+'bus.js', [("    if (signInRequired(res, body)) { signOutSso(); throw signedOut(); }\n    if (!res.ok || !body || !Array.isArray(body.rows))", "    if (!res.ok || !body || !Array.isArray(body.rows))")], P, '^a 401'),
+ ('bus.js fetchApi ignores 401 sign-in required (F1)', F+'bus.js', [("    if (signInRequired(res, body)) { signOutSso(); throw signedOut(); }\n    if (!res.ok || !body || typeof body !== 'object'", "    if (!res.ok || !body || typeof body !== 'object'")], P, '^a 401'),
+ ('app.js getJSON ignores 401 sign-in required (24)', F+'app.js', [("    if (signInRequired(res, body)) { sso = true; signOut(); throw signedOut(); }\n    return { ok: res.ok, body };", "    return { ok: res.ok, body };")], P, '^a 401'),
+ ('app.js api() ignores 401 sign-in required (24)', F+'app.js', [("    if (signInRequired(res, result)) { sso = true; signOut(); throw signedOut(); }\n", "")], P, '^a 401'),
+ ('signInRequired takes any 401 (24)', F+'app.js', [("res.status === 401 && body?.error === 'sign-in required'", "res.status === 401")], P, '^a 401'),
+ ('Sign out shown without the sso condition (F7)', F+'app.js', [("if (config.sso === true) { sso = true; $('sign-out').hidden = out(); }", "{ $('sign-out').hidden = out(); }")], P, '^the Sign out'),
+ ('form-action without the end-session origins (CSP)', B, [("form-action 'self'${sso ? sso.formTargets().map(o => ` ${o}`).join('') : ''}`", "form-action 'self'`")], T, '^13: the CSP'),
+ ('import oauth4webapi at module load (copies)', S, [("let oauth;\n", "import * as oauth from 'oauth4webapi';\n"), ("  oauth ??= await import('oauth4webapi');\n", "")], 'tests/pinned-copy.test.mjs', '^serve runs from a copy'),
+ ('restore the r1 relative returnPath (14, webby-0019 B1)', S, [("      if (u.origin !== publicOrigin) return home;\n      const out = new URL(`${publicOrigin}${u.pathname}${u.search}`);\n      return out.origin === publicOrigin ? out.href : home;", "      return u.origin === publicOrigin ? u.pathname + u.search : '/';")], T, '^14:'),
+ ('drop the second origin check (14, sage-1403)', S, [("      return out.origin === publicOrigin ? out.href : home;", "      return `${publicOrigin}${u.pathname}${u.search}`;")], T, '^14:'),
+]
+sha = lambda b: hashlib.sha256(b).hexdigest()
+only = sys.argv[2:]
+os.chdir(W)
+survived = []
+for i, (name, path, pairs, test, pat) in enumerate(M, 1):
+    if only and str(i) not in only: continue
+    orig = open(path, 'rb').read(); h = sha(orig)
+    src = orig.decode()
+    for a, b in pairs:
+        if src.count(a) != 1: sys.exit(f'ABORT {i} {name}: pattern found {src.count(a)} times')
+        src = src.replace(a, b)
+    try:
+        open(path, 'w').write(src)
+        p = subprocess.Popen(['node', '--test', f'--test-name-pattern={pat}', test], stdout=subprocess.PIPE, stderr=subprocess.STDOUT, start_new_session=True)
+        try: out, _ = p.communicate(timeout=240)
+        except subprocess.TimeoutExpired:
+            os.killpg(p.pid, signal.SIGKILL); out, _ = p.communicate(); out += b'\nTIMEOUT'
+        text = out.decode(errors='replace')
+        ran = [l for l in text.splitlines() if l.startswith('ℹ tests ')]
+        verdict = 'KILLED' if p.returncode != 0 else 'SURVIVED'
+        if verdict == 'SURVIVED': survived.append(name)
+        print(f'{i:2} {verdict} {name} [{ran[0] if ran else "no count"}]', flush=True)
+    finally:
+        open(path, 'wb').write(orig)
+        if sha(open(path, 'rb').read()) != h: sys.exit(f'ABORT restore failed for {path}')
+print('survived:', survived or 'none')
@@ -0,0 +1,158 @@
+# Row 200: `stack-release.sh activate --sso` (Q175 phase 2 prerequisite)
+
+Launchpad, 2026-10-20. Author Launchpad, reviewer Webby, gate owner Sage. Issue #1698. Brief
+`docs/plans/2026-10-20_stack-release-sso.md` (blob 426336b177f6). Rulings sage-1389 (R1 uses the activation onto
+the current copy, plus a same-copy test and a latest-set mutant), sage-1403 and sage-1407 (N4), mos-1056 item 5
+(N4 is a window acceptance item), sage-1432 (round 2 for webby-0028 N1 and N2).
+
+Base 4d487dfdc (`base.txt`): aa1bd209e plus row 192's two commits picked. 48359dbfa is 83b32d8d8 (patch-id
+8d11f48a9e03) and 4d487dfdc is r2 37582e820 (patch-id 0e32af8aa2a4 on both). The webui tree at the base matches
+`launchpad/row192` at 37582e820 path for path. Candidate: r1 5dc0b5534 and the round 2 commit on `launchpad/row200`.
+`candidate-manifest.sha256` lists its 3 paths; the packet files are not in it. Drift check at commit time:
+`git log aa1bd209e..origin/refactor` (origin/refactor 9ba31b5b3 at round 2) touches none of the 3 paths.
+
+No test touches `~/.mosaic-dev`, `~/.config/mosaic-dev`, `~/.mosaic`, a live unit or a live slot. T56 runs on
+the scratch roots and seeded pointers rows 187 and 189 use. Its config and slot sit in the test's temp dir,
+and the slot carries the `proofFile` read watch, so a run that opened it would fail the test.
+
+## Files
+
+| Path | Change |
+| --- | --- |
+| `scripts/stack-release.sh` | `--sso` on activate (usage, parse, `sso_for_target`), `sso_checks` and `slot_problem` (item 2), `sso_base` (rollback flags, item 3), `config_checks` (item 3 and N4), the `sso:` plan line and step lines. |
+| `packages/cli/tests/stack-release.test.mjs` | Fixture copies gain row 192's `--sso` marker, an old loader without `console`, and a C copy whose `ALGS` lack RS256. T56, 10 subtests (2 in round 2). |
+| `docs/TOOLS.md` | Usage line and two paragraphs after row 189's `--no-send`. |
+
+## What it does
+
+1. **Item 1.** `activate ID BUSINESS --sso` drops `--public-host`, `--auth-header`, `--allow-user` and any proof
+   pair, and puts `--sso` after the other flags, before `--send` and `--tester-port`, as `webui-service.sh`
+   renders it (`sso_for_target`, `:775`). It may name the live copy once. After that, both a plain activate and
+   an `--sso` activate refuse `already-active`. Later activates carry `--sso` (`sso: carried`; T56 covers
+   activate, not `pm-on`, which carries the pointer's flags as it does for every flag).
+   `--plan` prints `sso: on; drops ...; carries ...`, plus the proof line's `dropped; --sso drops header ...`.
+   `--sso` with a pair, with `--no-proof` or on another verb is a usage error.
+2. **Item 2** (`sso_checks`, `:817`). These checks run whenever the run's Console flags hold `--sso`, before
+   anything stops:
+   - `sso-target`: the target's `cli.mjs` has no `--sso`.
+   - `sso-config`: the target copy's own `checkConsole` refuses `console`, or there is no `console.sso`. The
+     config is parsed in node, and only the message's first line is kept. A JSON parse error never quotes
+     the text.
+   - `sso-slot`: one per provider, from `lstat`, `stat` and `realpath` in `readSlot`'s order (`slot_problem`,
+     `:847`). The slot is never opened.
+3. **Item 3.**
+   - **Rollback** (`sso_base`, `:728`): from an `--sso` pointer to a copy without `--sso`, the Console flags
+     come from the rollback set of the activation that moved the stack onto the pointer's copy from the
+     target (`from_log arrival`). That set's `show-mosaic-webui.service.txt` is checked against its
+     `SHA256SUMS`. `--send` and `--tester-port` follow the pointer.
+   - **`sso-rollback-flags`** refuses when that set is missing, fails its sums, holds no readable argv, or
+     already ran `--sso`.
+   - **`config-console-key`** (`config_checks`, `:866`): any activate or rollback refuses before anything
+     stops when the config has a `console` key that the target's `scripts/mosaic-config.mjs validate` refuses.
+     The message says to remove the key first (restore step 1's backup), then run the verb again.
+4. **N4, the first half** (sage-1403, sage-1407). With no `console.sso` and the stack on another copy, the
+   `sso-config` refusal names the first step: "activate ID without --sso first, then write console.sso, then
+   run activate ID --sso". A copy before row 192 refuses the key, so the re-pin comes first. The `--sso`
+   activate is then the allowed same-copy re-pin.
+5. **TOOLS.md.** The flag, its refusals, the rollback rule and the N4 order.
+
+## Window plan acceptance item (N4, mos-1056 item 5, sage-1407)
+
+For the row 200 window plan, word for word:
+
+- **Before the `console` key is written, the window re-pins to row 192 or later.** Check line, run before the
+  key is written: `git -C /mnt/storage/src/mosaic-stack merge-base --is-ancestor <row 192 landing sha>
+  <pointer copy sha from scripts/stack-release.sh status acme> && echo REPIN_OK`. It must print `REPIN_OK`.
+  If the window instead runs `activate <ID> acme --sso --plan` before the key is written, the
+  `refuses sso-config:` line must end with "activate <ID> without --sso first, then write console.sso, then run
+  activate <ID> --sso". It names that step only when the pointer is on another copy.
+- **A rollback past row 192 removes the key first.** Check line, run before the rollback:
+  `scripts/stack-release.sh rollback acme --plan` must print no `refuses config-console-key:` line. If it
+  prints one, restore `config.json` from the window's step 1 backup and run the plan again. The rollback itself
+  refuses on the same check, so a skipped step stops it before anything stops.
+- **Back-out line (webby-0028 N4, sage-1432).** Once a copy with `--sso` support is live, no verb turns `--sso`
+  off. Only a rollback to a copy before row 192 gets the preview set back, after the `console` key is removed
+  (the check line above).
+
+## Tests run (this worktree, final tree)
+
+- `node --test --test-name-pattern='^T56' tests/stack-release.test.mjs`: 10/10 on the round 2 tree
+  (`/mnt/storage/scratch/launchpad-r200/t56-r2c.log`). Round 1 was 8/8 (`t56-6.log`).
+- The whole file, the cli suite and every `scripts/test-*.sh` go to Sage's gate. T1 to T55 have not run on
+  this tree.
+
+## Mutants (`mutants.py`, run as `python3 mutants.py <tree> [N ...]`, each against T56)
+
+| # | Mutant | Result |
+| --- | --- | --- |
+| 1 | no `sso-target` refusal (item 2) | KILLED |
+| 2 | no `sso-config` refusal (item 2) | KILLED |
+| 3 | no `sso-slot` refusal (item 2) | KILLED |
+| 4 | no `sso-rollback-flags` refusal (item 3) | KILLED |
+| 5 | no `config-console-key` refusal (item 3) | KILLED |
+| 6 | keep `--auth-header` under `--sso` (item 1) | KILLED |
+| 7 | keep `--public-host` under `--sso` (item 1) | KILLED |
+| 8 | rollback takes the latest activation onto the copy, not the arrival (sage-1389) | KILLED |
+| 9 | `sso-config` names no first step (N4) | KILLED |
+| 10 | `slot_problem` compares the unresolved `REPO` (round 2, N1) | not run, Sage's gate |
+| 11 | `proof_file_problem` compares the unresolved `REPO` (round 2, N1) | not run, Sage's gate |
+| 12 | `config_checks` passes a config that doesn't parse (round 2, N2) | not run; equivalent if it survives, guard kept (sage-1446) |
+
+9/9 killed (`/mnt/storage/scratch/launchpad-r200/mutants.log`). The script restored `stack-release.sh`, and it
+matches its pre-run sha256. No mutant hit the 300 s timeout. This batch ran without Sage's slot (sage-1414),
+while Darkwing's gate was running, so Sage reruns all 9 on the row 200 gate and doesn't take these results
+(sage-1423). Mutants 10 to 12 are new in round 2 and have not run. Sage runs 1 to 12 on the gate (sage-1446). Mutant 5's
+pattern now names the `holds` message, because the round 2 message also starts with `config-console-key "$cfg`.
+Every pattern matches once on the round 2 tree.
+
+## Choices
+
+- **R1, `--send` and `--tester-port` follow the pointer.** These two flags come from the pointer, not from the
+  rollback set, so a `--no-send` or a tester port set after the arrival stays. This is row 189's rule that
+  rollback carries `--send` off. Tradeoff: the rolled-back Console differs from the set's unit in those two
+  flags, and the plan line says so.
+- **`config_checks` runs for activate too**, not only rollback. An activate onto a pre-192 copy with the key
+  in place breaks that copy's loader the same way.
+- **The inside-repository slot test** symlinks the secrets directory to a temp dir under the fixture repo. The
+  slot file is then not a link, but its real path is inside the repository.
+
+## Not tested
+
+- The slot owner-uid refusal: it needs a file owned by another uid, which needs privilege.
+
+## Review r1 notes (webby-0028, non-blocking)
+
+- **N1.** `slot_problem` (`:859`) and row 187's `proof_file_problem` (`:988`) compare a resolved path to
+  `REPO="$(pwd)"` (`:26`), which is not resolved. Run through the `~/src/mosaic-stack-dev-test` symlink, a slot
+  inside the repository passes here, and the Console refuses it after the stop. Confirmed by reading; Sage
+  rules on a round 2 or a follow-up.
+- **N2.** `config_checks` (`:868`) returns 0 when config.json doesn't parse. Same ruling.
+- **N3.** A check this script doesn't make: `slot_problem` refuses only a size of 0. A slot holding only a
+  newline, or two lines, passes here, and the Console's one-non-empty-line rule (`readSlot`) refuses it after
+  the stop. Reading the content would break the rule that this script never opens the slot.
+- **N4, for the window's back-out step.** Once the live copy supports `--sso`, no verb turns `--sso` off on it.
+  The only way back to the preview set is a rollback to a copy before row 192, which removes the `console` key
+  first (the second check line above).
+
+## Round 2 (sage-1432: N1 and N2; N3 and N4 stay notes)
+
+- **N1.** `slot_problem` (`:847`) and `proof_file_problem` (`:989`) now compare the slot's real path with
+  `realpath -m` of both `REPO` and `COPIES`, and refuse "cannot be resolved" if either fails. T56's
+  "round 2 (webby-0028 N1)" subtest runs the script through a symlink to the fixture repo
+  (`repo-link.200/scripts/stack-release.sh`). A proof file inside the repository is refused `proof-file-invalid`,
+  and a slot whose secrets directory links into the repository is refused `sso-slot` "is inside the repository
+  or the copies". Mutants 10 and 11 undo each check.
+- **N2, with a deviation.** `config_checks` (`:867`) now tells "no key" (node exits 1) from "doesn't parse"
+  (exits 2) and refuses `config-console-key` "cannot be read as JSON" on the second. But webby-0028's case
+  doesn't reach it: `load_config` (common.sh, through `scripts/mosaic-config.mjs env`) exits 1 on a config that
+  doesn't parse, before anything is read or stopped. So the refusal is a guard for a config that changes after
+  `load_config` ran, and no test reaches it without a race. The T56 subtest "round 2 (webby-0028 N2)" checks
+  what does happen: activate, rollback and `activate --plan` each exit 1 with "common: configuration load
+  failed", the pointer, the start/stop log and the activation log are unchanged, and activate works after the
+  config is restored. Mutant 12 drops the guard and is expected to survive as equivalent for that reason. sage-1446:
+  the guard stays, and mutant 12 is equivalent if it survives, the same call as row 192's mutant 23.
+- **N4.** The back-out line is in the window plan section above.
+
+## Not done here
+
+- No change to the live pointer, units or config. The phase 2 window is Sage's and Mos's.
@@ -0,0 +1 @@
+4d487dfdc468c58e3790976c3d4276fe60816fbe
@@ -0,0 +1,3 @@
+6ee1adb3951aeb1e3862cb119c12b600b88641f325912c09840b841761aa12dd  docs/TOOLS.md
+9b231532d14b21d0d39ca89035d9067e827e18cc1cf3dfe298bef840ae87ff0c  packages/cli/tests/stack-release.test.mjs
+d24e75e9927623ad106b55bce82e40ddf7677d483626fb46923c3b3c7c1148ad  scripts/stack-release.sh
@@ -0,0 +1,48 @@
+# Row 200 (#1698) mutants: `python3 mutants.py <tree> [N ...]`. Each applies to the tree's scripts/stack-release.sh,
+# runs T56 in packages/cli/tests/stack-release.test.mjs and restores the file from a saved copy, checked by sha256.
+# Killed = test exit != 0.
+import hashlib, os, subprocess, sys, signal
+R = os.path.abspath(sys.argv[1])
+S = os.path.join(R, 'scripts', 'stack-release.sh')
+if not os.path.isfile(S): sys.exit(f'ABORT no scripts/stack-release.sh under {sys.argv[1]}')
+T, PAT = 'tests/stack-release.test.mjs', '^T56'
+M = [
+ ('no sso-target refusal (item 2)', [("    sso_supported || { check_refuse sso-target", "    true || { check_refuse sso-target")]),
+ ('no sso-config refusal (item 2)', [('        check_refuse sso-config "$TO', '        : "$TO')]),
+ ('no sso-slot refusal (item 2)', [('[ -z "$why" ] || check_refuse sso-slot', '[ -z "$why" ] || : sso-slot')]),
+ ('no sso-rollback-flags refusal (item 3)', [('        check_refuse sso-rollback-flags "$TO', '        : "$TO')]),
+ ('no config-console-key refusal (item 3)', [('    check_refuse config-console-key "$cfg holds', '    : "$cfg holds')]),
+ ('keep --auth-header under --sso (item 1)', [("            --public-host | --auth-header | --allow-user)", "            --public-host | --allow-user)")]),
+ ('keep --public-host under --sso (item 1)', [("            --public-host | --auth-header | --allow-user)", "            --auth-header | --allow-user)")]),
+ ('rollback takes the latest activation onto the copy, not the arrival (sage-1389)', [('o.to===current&&o.from!==current){process.stdout.write(`${o.activation', 'o.to===current){process.stdout.write(`${o.activation')]),
+ ('sso-config names no first step (N4)', [('            first="; activate $TO without --sso first, then write console.sso, then run activate $TO --sso"', '            first=""')]),
+ ('slot_problem compares the unresolved REPO (round 2, webby-0028 N1)', [('    case "$real" in "$repo" | "$repo"/* | "$copies" | "$copies"/*) echo "is inside the repository or the copies"; return ;; esac\n    [ "$size" != 0 ]', '    case "$real" in "$REPO" | "$REPO"/* | "$copies" | "$copies"/*) echo "is inside the repository or the copies"; return ;; esac\n    [ "$size" != 0 ]')]),
+ ('proof_file_problem compares the unresolved REPO (round 2, webby-0028 N1)', [('    case "$real" in "$repo" | "$repo"/* | "$copies" | "$copies"/*) echo "is inside the repository or the copies"; return ;; esac\n    [ "$mode" = 600 ]', '    case "$real" in "$REPO" | "$REPO"/* | "$copies" | "$copies"/*) echo "is inside the repository or the copies"; return ;; esac\n    [ "$mode" = 600 ]')]),
+ ('config_checks passes a config that does not parse (round 2, webby-0028 N2; expected equivalent)', [('    [ "$key" != 1 ] || return 0', '    [ "$key" = 0 ] || return 0')]),
+]
+sha = lambda b: hashlib.sha256(b).hexdigest()
+only = sys.argv[2:]
+os.chdir(os.path.join(R, 'packages', 'cli'))
+survived = []
+for i, (name, pairs) in enumerate(M, 1):
+    if only and str(i) not in only: continue
+    orig = open(S, 'rb').read(); h = sha(orig)
+    src = orig.decode()
+    for a, b in pairs:
+        if src.count(a) != 1: sys.exit(f'ABORT {i} {name}: pattern found {src.count(a)} times')
+        src = src.replace(a, b)
+    try:
+        open(S, 'w').write(src); os.chmod(S, 0o755)
+        p = subprocess.Popen(['node', '--test', f'--test-name-pattern={PAT}', T], stdout=subprocess.PIPE, stderr=subprocess.STDOUT, start_new_session=True)
+        try: out, _ = p.communicate(timeout=300)
+        except subprocess.TimeoutExpired:
+            os.killpg(p.pid, signal.SIGKILL); out, _ = p.communicate(); out += b'\nTIMEOUT'
+        text = out.decode(errors='replace')
+        ran = [l for l in text.splitlines() if l.startswith('ℹ fail ')]
+        verdict = 'KILLED' if p.returncode != 0 else 'SURVIVED'
+        if verdict == 'SURVIVED': survived.append(name)
+        print(f'{i:2} {verdict} {name} [{ran[0] if ran else "no count"}]', flush=True)
+    finally:
+        open(S, 'wb').write(orig); os.chmod(S, 0o755)
+        if sha(open(S, 'rb').read()) != h: sys.exit(f'ABORT restore failed for {S}')
+print('survived:', survived or 'none')
@@ -0,0 +1,8 @@
+# Megavolt
+
+Builder seat, Claude Opus 5.5, started by Sage under mos-0974 and mos-0977 item 5 for MVP T1 item 6, the
+credential store per agent with its own git identity (#1697).
+
+No launcher in this directory. The seat runs as a T3 thread and works in its own worktree. It has no
+credentials of its own; until the credentials row settles per-agent identity, it pushes only its own `megavolt/*`
+branches through the repository credential helper (mos-0981), never `refactor`, `main` or another seat's branch.
@@ -0,0 +1,7 @@
+# Morgana
+
+Builder seat, Claude Opus 5.5, started by Sage for MVP T1 row 193 (human users and RBAC, #1691) under mos-0974 and mos-0977.
+
+No launcher in this directory. The seat runs as a T3 thread and works in its own worktree. It has no
+credentials of its own; until the credentials row settles per-agent identity, it pushes only its own `morgana/*` branches
+through the repository credential helper (mos-0981), never `refactor`, `main` or another seat's branch.
@@ -0,0 +1,8 @@
+#!/bin/bash
+n=0
+for p in /proc/[0-9]*; do
+  c=$(tr '\0' ' ' < $p/cmdline 2>/dev/null) || continue
+  case "$c" in *shell-snapshots*|*chrome-devtools-mcp*|*sage-busy-now*) continue;; esac
+  if echo "$c" | grep -qE 'node --test|gate\.sh|mutant|scripts/test-[a-z-]+\.sh|docker compose'; then echo "BUSY ${p#/proc/}: ${c:0:160}"; n=$((n+1)); fi
+done
+[ $n -eq 0 ] && echo CLEAR
@@ -0,0 +1,24 @@
+#!/bin/bash
+set -o pipefail
+# Landing gate template (2026-10-14): sed the G= and OUT= lines and this comment.
+# Sequential suites, each teed to its own log; stops at the first failure.
+G=/mnt/storage/scratch/SET-ME-wt
+OUT=/mnt/storage/scratch/SET-ME-out
+cd "$G" || exit 9
+mkdir -p "$OUT" || exit 9  # a missing OUT failed the row 142 gate at step 1 (2026-10-15)
+# test-task.sh live cases run `docker compose` from $G, so without a name the project is "wt"
+# and leaves wt_default behind (row 142 gate, 2026-10-15). Name it per gate dir and remove it on exit.
+export COMPOSE_PROJECT_NAME="$(basename "$(dirname "$G")")"
+trap 'docker network rm "${COMPOSE_PROJECT_NAME}_default" >/dev/null 2>&1 && echo "removed network ${COMPOSE_PROJECT_NAME}_default"' EXIT
+# A gate tree without the node_modules link fails cli tests with ENOENT (2026-10-13).
+[ -d "$G/node_modules" ] || { echo "STOP no node_modules in $G"; exit 8; }
+echo "base $(git rev-parse --short HEAD) dirty $(git status --short | grep -vc node_modules) DOCKER_HOST=${DOCKER_HOST:-unset}"
+run() { local name="$1" dir="$2" cmd="$3"
+  (cd "$G/$dir" && bash -c "$cmd") > "$OUT/$name.log" 2>&1; local rc=$?
+  echo "$name rc=$rc $(grep -E '^ℹ (pass|fail) [0-9]+' "$OUT/$name.log" | tr '\n' ' ') | $(tail -n1 "$OUT/$name.log")"
+  [ $rc -eq 0 ] || { echo "STOP $name"; exit $rc; }; }
+# No pkg-queue step: scripts/test-queue.sh runs packages/queue/tests/ itself (same 156 tests; CI debate item 2a, Vikunja #274).
+for d in packages/*/; do p=$(basename "$d"); [ -d "$d/tests" ] || continue; [ "$p" = queue ] && continue
+  run "pkg-$p" "packages/$p" 'node --test tests/*.test.mjs'; done
+for s in scripts/test-*.sh; do n=$(basename "$s" .sh); run "script-${n#test-}" . "bash $s"; done
+echo GATE_PASSED
@@ -0,0 +1,36 @@
+# Row 189 gate timing (for row 197, Herb)
+
+Sage, 2026-10-20T19:25:04Z. Gate on 0c177e9ef (base 0217b71c8), one lane. The slot was mine. Seats may have run single test files at the same time, which the slot rules allow, and I did not record that.
+Start 2026-10-20T19:09:37Z, end 2026-10-20T19:20:36Z. Total wall time: 659 s.
+
+Wall time per suite is the gap between one suite's log mtime and the one before it (the first suite starts at start.txt), so it includes node start-up. node's duration_ms is listed where the suite prints it. Scripts print no duration.
+
+| Suite | Wall s | duration_ms s | Ended (UTC) |
+|---|---|---|---|
+| pkg-bus | 3 | 3.8 | 19:09:40 |
+| pkg-business | 3 | 2.2 | 19:09:43 |
+| pkg-cli | 388 | 388.5 | 19:16:11 |
+| pkg-control-board | 1 | 0.8 | 19:16:12 |
+| pkg-conversation | 35 | 35.4 | 19:16:47 |
+| pkg-discord | 3 | 2.6 | 19:16:50 |
+| pkg-harness | 12 | 11.6 | 19:17:02 |
+| pkg-ledger | 13 | 13.5 | 19:17:15 |
+| pkg-mosaic | 3 | 2.3 | 19:17:18 |
+| pkg-plugins | 0 | 0.3 | 19:17:18 |
+| pkg-project | 1 | 1.2 | 19:17:19 |
+| pkg-runs | 1 | 0.8 | 19:17:20 |
+| pkg-seat | 6 | 6.2 | 19:17:26 |
+| pkg-tasks | 1 | 1.2 | 19:17:27 |
+| pkg-webui | 58 | 57.9 | 19:18:25 |
+| script-auth | 1 | - | 19:18:26 |
+| script-conductor | 5 | - | 19:18:31 |
+| script-config | 2 | - | 19:18:33 |
+| script-discord | 8 | - | 19:18:41 |
+| script-extension-package | 1 | - | 19:18:42 |
+| script-foundation | 40 | - | 19:19:22 |
+| script-land-work | 11 | - | 19:19:33 |
+| script-queue | 21 | - | 19:19:54 |
+| script-release | 11 | - | 19:20:05 |
+| script-task | 31 | - | 19:20:36 |
+
+Source: /mnt/storage/scratch/sage-g189/out/*.log mtimes and gate.log. The cli suite is about 59% of the run, and webui plus conversation add about 14%.
@@ -1,8 +1,42 @@
 # Q175 design: the Console verifies SSO itself (Vikunja #412)

-Author Sage, 2026-10-20. Reviewer Filbert, and the review comes before any code. Line numbers are at refactor
-4ca8d6e94. This replaces Part B (row 178 proxy proof, #385 comments 345 and 353). #385 stays open until the
-Console stops trusting `X-authentik-username`.
+Author Sage, 2026-10-20, r3. Reviewer Filbert, and the review comes before any code. Line numbers are at
+refactor 4ca8d6e94 unless a line says otherwise. This replaces Part B (row 178 proxy proof, #385 comments 345
+and 353). #385 stays open until the Console stops trusting `X-authentik-username`.
+
+## Changes from r2 (Filbert's r2 review, CHANGES)
+
+- C1: the `console` key goes into the shared loader, scripts/mosaic-config.mjs, which today refuses any
+  unknown top-level key (:113). Section 4 names the blast radius. Jason step 4 moves inside the phase 2
+  window, after the pin and before the Console starts. The phase 2 rollback removes `console` first. A
+  test-config.sh case covers it (test 25). Mos confirms the sequence before phase 1 (section 5).
+- C2: under `--sso` the page treats a 401 `sign-in required` as signed out and links to
+  `/auth/login?return=<path>` (section 5 phase 1, test 24).
+- Notes: tests 7 and 15 are built so that only the record rule refuses; test 9a is an alg test; Q-B's two
+  classes are defined, and test 23 adds a 200 HTML page; the phase 2 scratch Console uses a scratch config,
+  a dummy slot, no `--send` and no `--tester-port`.
+- r3 fix (Filbert r3 approve): D1, the loader checks the slot reference's shape only, and the file checks
+  run in the Console's `--sso` start; D2, the slot resolves from the config dir, and the scratch Console has
+  a scratch dataRoot and an unreachable issuer (section 5).
+- Q-E: settled as Filbert ruled. The `subject-unknown` line keeps iss and sub, JSON-escaped and capped
+  (section 1, tests 10 and 19).
+
+## Changes from r1 (Filbert's r1 review, CHANGES)
+
+- B1: the provider config moves to `~/.config/mosaic-dev/config.json` (section 4). Mos agreed (mos-0973). The
+  Console prints provider ids, issuers and subject counts at start. The rehearse-strip follow-up is dropped.
+- B2: one return-path rule, `new URL(ret, publicOrigin).origin === publicOrigin` (section 1 step 7), with
+  tests for `/\evil.example` and `/%09/evil.example`.
+- B3: refusals log a fixed code and the provider id, never the error or its cause (section 1).
+- B4: login records are capped at 32 (section 1 step 1), with a test.
+- B5: test 9 splits into a forged payload under a real kid and a kid missing from the JWKS, and a try/catch
+  mutant joins the list. Test 2 no longer claims the signature mutant (section 9).
+- B6: the phase 2 forged-header check runs on a scratch Console, or Mos or Jason runs it on live (section 5).
+- Rulings: Q-B start degraded (section 4), Q-C only the public Host on 7332 (section 3), Q-D keep 1 h idle
+  but polls don't count as activity (section 3).
+- Section 6: `startServer` throws on `tester && sso`, and `human` joins `tester` as a refused subject label.
+- The missing tests and nits N1-N5 are in sections 1, 3, 7 and 9.
+- Section 8: the human-cli statement stays as written (mos-0972). The recommendation is now Mos's ruling.

 ## The ruling this implements

@@ -22,7 +56,9 @@ trust with verification" and confirmed five points (mos-0970):
 ## What exists today

 The live Console runs from copies/490e2771d3d0 with `--public-host mosaic.woltje.com --auth-header
-X-authentik-username --allow-user jason.woltje --send --tester-port 7333`.
+X-authentik-username --allow-user jason.woltje --send --tester-port 7333`. Row 189 (#1687, P19 #413) adds
+`stack-release.sh activate --no-send`, and Mos's ruling mos-0972 takes `--send` off the live Console until
+phase 2.

 - `previewOptions` (packages/webui/src/serve.mjs:205) builds `{ host, header, user }`.
 - A request is `named` when its Host equals the public name (:493). A named request passes sign-in when it
@@ -45,41 +81,73 @@ New module `packages/webui/src/sso.mjs`, used only by the human listener (7332).

 | Route | Method | What it does |
 |---|---|---|
-| `/auth/login` | GET | One provider configured: start its flow. Several: a plain page listing them, each a link to `/auth/login?provider=ID`. |
+| `/auth/login` | GET | One provider configured: start its flow. Several: a plain page listing them, each a link to `/auth/login?provider=ID`. A provider whose discovery hasn't succeeded gets 503 (section 4). |
 | `/auth/callback` | GET | Finish the flow, create the session, 303 to the saved return path. |
 | `/auth/logout` | POST | Same-origin checks, delete the session, 303 to the provider's `end_session_endpoint`. |
 | `/auth/signed-out` | GET | Static "signed out" page with a sign-in link. |

+Every URL the Console hands a provider is built from the configured `publicOrigin`: `redirect_uri` is
+`publicOrigin + '/auth/callback'` and `post_logout_redirect_uri` is `publicOrigin + '/auth/signed-out'`. No
+code path reads the request's Host to build them (N2).
+
 The flow per provider:

 1. Start. Generate a state, a nonce and a PKCE verifier (`generateRandomState`, `generateRandomNonce`,
   `generateRandomCodeVerifier`), and a challenge with `calculatePKCECodeChallenge` (S256 only). Put them, the
-   provider id and the return path in a server-side login record keyed by a random id. Set
-   `__Host-mosaic_login` to that id. 303 to `authorization_endpoint` with `response_type=code`,
-   `scope=openid profile email`, `code_challenge_method=S256`, `redirect_uri`, `state` and `nonce`.
+   provider id, the return path and an expiry 10 minutes out in a server-side login record keyed by a random
+   id. The store holds at most 32 login records; a new one evicts the oldest (B4). Set `__Host-mosaic_login` to
+   that id. 303 to `authorization_endpoint` with `response_type=code`, `scope=openid profile email`,
+   `code_challenge_method=S256`, `redirect_uri`, `state` and `nonce`.
 2. Callback. Read exactly one `__Host-mosaic_login` cookie, then take and delete its record (single use, so a
   replayed callback finds nothing). Expire the cookie in the response. The provider comes from the record,
-   never from the query, which stops a mix-up between providers.
+   never from the query, which stops a mix-up between providers. Two tabs signing in at once each set the
+   cookie, so the later one wins and the earlier tab's callback finds no record and gets the 403 page with a
+   sign-in link (N5). That costs one retry and keeps one cookie per browser.
 3. `validateAuthResponse(as, client, url, record.state)` checks state, refuses an error response, and checks
   the `iss` parameter when the provider advertises RFC 9207.
-4. `authorizationCodeGrantRequest(as, client, clientAuth, params, redirectUri, record.verifier)`, then
-   `processAuthorizationCodeResponse(as, client, response, { expectedNonce: record.nonce, requireIdToken: true })`.
-   That checks iss, aud (and azp when aud has several values), exp, iat and nonce, and checks `alg` against
-   `client.id_token_signed_response_alg`.
+4. `authorizationCodeGrantRequest(as, client, clientAuth, params, redirectUri, record.verifier)` returns a
+   `Response`. Keep that object. `processAuthorizationCodeResponse(as, client, response, { expectedNonce:
+   record.nonce, requireIdToken: true })` checks iss, aud (and azp when aud has several values), exp, iat and
+   nonce, and checks `alg` against `client.id_token_signed_response_alg`. That field gets the provider's whole
+   `algs` array, which the library's `checkSigningAlgorithm` accepts, so a provider listing RS256 and ES256
+   takes either and nothing else (N1). Test 16 pins this.
 5. Signature. oauth4webapi does not verify the signature of an ID token that came straight from the token
   endpoint over TLS (OIDC Core 3.1.3.7 allows that, and the library docs for
   `validateApplicationLevelSignature` say so). Point 2 asks for the JWKS check, so the callback always calls
-   `validateApplicationLevelSignature(as, response)` after step 4. It fetches the JWKS from the discovered
-   `jwks_uri`, picks the key by `kid` and `alg`, and refuses HS* outright.
-6. Our own checks on top of the library: `header.alg` is in the provider's configured `algs`, the token's
-   `iss` equals the configured issuer exactly, and `(iss, sub)` is in the provider's `subjects` list. Anything
-   else is a 403 that logs `refused sign-in iss=... sub=...` (never a token, code or cookie).
-7. Create the session (section 3) and 303 to the return path. The return path must start with one `/` and
-   is otherwise replaced with `/`.
+   `validateApplicationLevelSignature(as, response)` with the same `Response` object from step 4. It fetches
+   the JWKS from the discovered `jwks_uri`, picks the key by `kty`, `kid`, `alg` and `use`, and refuses HS*
+   outright. On a `kid` it doesn't have, it refetches the JWKS once if the cache is at least 60 s old, which
+   covers key rotation (test 18). The call is not wrapped in a catch that continues; its throw ends the
+   callback.
+6. Our own checks on top of the library: `header.alg` is in the provider's `algs`, the token's `iss` equals
+   the configured issuer as a raw string compare, with no URL normalising (N3; the library's discovery check
+   compares normalised hrefs, so this one is stricter), and `(iss, sub)` is in the provider's `subjects` list.
+7. Create the session (section 3), then 303 to the return path. The rule (B2): resolve
+   `u = new URL(ret, publicOrigin)`, and use `u.pathname + u.search` only when
+   `u.origin === publicOrigin`; otherwise use `/`. A missing or unparsable `ret` gives `/`.

 Every refusal in steps 2-6 ends at a 403 page saying sign-in failed, with a link back to `/auth/login`. No
 step falls back to a header.

+Logging (B3). A refusal logs one line: a fixed code from a closed list (`login-record-missing`,
+`state-mismatch`, `auth-error-response`, `grant-failed`, `id-token-invalid`, `signature-invalid`,
+`alg-refused`, `issuer-mismatch`, `subject-unknown`, `discovery-failed`, `jwks-failed`) and the provider id.
+It never logs the exception, its message or its `cause`. oauth4webapi's errors carry token bodies and claims
+in `cause`, so even a message can leak. The one extra field is on `subject-unknown`: it logs `iss` and `sub`,
+because Jason step 3 reads his `sub` from that line (Q-E, Filbert's ruling). Authentik's default subject mode
+is a hashed user id that its admin view doesn't show, so the line is the practical source. Neither value is a
+credential. Three conditions hold:
+
+- Only a token that passed steps 3-6 up to the subject check reaches this line. Every earlier refusal logs
+  its own code and the provider id only.
+- Both values are written with `JSON.stringify` and each is cut to 255 characters first. Any account at the
+  provider can get a signed token, so a `sub` may hold a newline, and an unescaped one would let a sign-in
+  forge a log line.
+- Test 10 uses a `sub` holding `\n` and a fake `refused sign-in` suffix and asserts one escaped line.
+
+Test 19 asserts that no log line holds a token, code, state, nonce, verifier, client secret or session id.
+It exempts only the `iss` and `sub` fields of the `subject-unknown` line.
+
 ### 2. Library: oauth4webapi 3.8.8, pinned exactly

 Mos's steer (mos-0971) was to prefer oauth4webapi over hand-rolled verification on `node:crypto` unless I
@@ -103,34 +171,78 @@ entry. Root is right because `scripts/stack-copy.sh:23-31` copies only the root
 webui's first runtime dependency. The root dependency rule (exact pins, never unversioned) applies to it.
 Upgrades are reviewed commits.

-### 3. Sessions, cookies and logout
+### 3. Sessions, cookies, Host and logout

- Session id: 32 random bytes, base64url. The store keys on its sha256, so a heap dump doesn't hold usable ids.
- Cookie `__Host-mosaic_session=<id>; Secure; HttpOnly; SameSite=Lax; Path=/`, no Domain, no Max-Age (a
-  browser-session cookie). The `__Host-` prefix makes the browser refuse it unless it was set over https on
-  this exact host.
- Login cookie `__Host-mosaic_login`, same attributes plus `Max-Age=600`. The login record also expires at
-  10 minutes server-side.
+- Session id: 32 random bytes, base64url. The store keys on its sha256 and holds no raw id, so a heap dump
+  doesn't hold usable ids. Test 20 checks that the store's keys and values never contain the cookie value.
+- Cookie, exactly: `__Host-mosaic_session=<id>; Path=/; Secure; HttpOnly; SameSite=Lax`, no Domain, no
+  Max-Age (a browser-session cookie). The `__Host-` prefix makes the browser refuse it unless it was set over
+  https on this exact host. Test 21 asserts the whole Set-Cookie value, and a mutant drops `HttpOnly`.
+- Login cookie `__Host-mosaic_login`, the same attributes plus `Max-Age=600`. The login record also expires
+  at 10 minutes server-side.
 - Lax, not Strict, because the callback is a top-level navigation from the provider's site, and a Strict
  cookie set there would be missing on the redirect to `/`. Lax still keeps the session off cross-site POSTs.
  The write routes keep their exact `Origin` and `Sec-Fetch-Site: same-origin` checks (:171, :250, :297, :340,
  :387, :425), so cross-site writes are refused twice.
- Lifetime: 8 h absolute, 1 h idle, both server-side. The store is in memory with a cap of 64 sessions
-  (oldest goes first), so a Console restart signs everyone out. That's acceptable for one human and keeps
-  sessions off disk.
+- Lifetime: 8 h absolute, 1 h idle, both server-side (Q-D, Filbert's ruling). The store is in memory with a
+  cap of 64 sessions (oldest goes first), so a Console restart signs everyone out. That's acceptable for one
+  human and keeps sessions off disk.
+- Activity (Q-D). Only a page load (a GET outside `/api/`) or a write (a POST) refreshes `seen`. The page's
+  background reads don't: `refresh` re-reads the board every 10 s (packages/webui/src/public/app.js:346) and
+  the 5 s timer at :301 redraws the age label. Without this rule an open tab would never go idle. Test 13
+  covers it.
 - The session holds `{ provider, iss, sub, name, idToken, created, seen }`. `name` is the subject entry's
  label. It goes where `preview.user` goes today (send logs, settings, seat routes), so the downstream writer
  shape stays as it is. `idToken` is kept only as the logout hint and never leaves the server.
+- Host (Q-C, Filbert's ruling). Under `--sso`, 7332 serves only requests whose Host is the public host.
+  Any other Host, loopback included, gets 403 `public Host required`, except `GET /healthz`. The loopback read
+  path at :509-512 is gone under `--sso`. Today's readers of 127.0.0.1:7332 and where they go:
+  - `scripts/webui-service.sh status` (:406), the stack-release gate (scripts/stack-release.sh:484) and the
+    rehearse gate (:1369) read only `/healthz`, which stays open on loopback.
+  - The webui README (:83) describes the loopback path. It changes in phase 1.
+  - Agent reads of the board go to the tester listener on 7333, which already serves reads. I found no other
+    code that reads 7332 on loopback. A person opening http://127.0.0.1:7332 in a local browser gets the 403
+    and uses the public URL instead.
+  Test 22 covers a loopback Host on `/`, `/api/board` and a write, and `/healthz` passing.
 - Every request on 7332 except `/healthz` and `/auth/*` needs a valid session. Without one, `/api/*` gets
  401 JSON and other GETs get a 303 to `/auth/login?return=<path>`.
 - Logout: `POST /auth/logout` with the same-origin checks. It deletes the session, expires the cookie, and
-  303s to `end_session_endpoint?id_token_hint=...&post_logout_redirect_uri=https://mosaic.woltje.com/auth/signed-out&client_id=...`.
+  303s to `end_session_endpoint?id_token_hint=...&post_logout_redirect_uri=<publicOrigin>/auth/signed-out&client_id=...`.
  If the provider has no `end_session_endpoint`, it goes straight to `/auth/signed-out`.
 - Limit: signing out at the provider does not end a Console session until idle or absolute expiry. Back-channel
  logout is a follow-up, not phase 1.

 ### 4. Provider config: shape and location

+Location (B1, Filbert's ruling, Mos agreed in mos-0973): a `console.sso` key in
+`~/.config/mosaic-dev/config.json`. The reason is who can write it. The business file is writable by agents
+through `organizationWriter` (the tester verbs and the chief's `organization.set`), so a provider entry there
+could be changed by the agents the Console is meant to keep out. config.json is user-authored and never
+auto-written: `scripts/bootstrap.sh` creates it and nothing overwrites it. Adding the key is a Jason step
+(section 10).
+
+The loader (C1). Every tool reads config.json through one loader, scripts/mosaic-config.mjs. Its `validate`
+refuses any top-level key other than `configVersion`, `environment`, `dataRoot` and `execution` with
+`unsupported configuration key` (:113). The business, seat, cli, discord, bootstrap, land-work, stack-copy and
+conductor-apply code all use it. So phase 1 changes the shared loader, not a Console-only reader:
+
+- mosaic-config.mjs accepts an optional `console` key, and the strict `console.sso` shape validator (the
+  config checks below, except the slot file checks) runs inside the loader. The fail-closed canon holds for
+  every reader. The loader checks shape only and never touches a slot file: `clientSecret` must be
+  `{ slot: <name> }` with the name matching `[a-z0-9-]{1,64}`. The file checks and the read run only in the
+  Console's `--sso` start (D1), so a missing slot or a 0640 slot stops the Console, not the stack.
+- The blast radius is the whole stack. A typo in `console.sso` makes every tool refuse the config, not just
+  the Console. That's the price of one loader, and the reason step 4 writes the key inside a window with a
+  backup first.
+- The other direction breaks too. A copy older than phase 1 refuses a config that has the key. If the key
+  went in before the phase 2 pin, the live copy (490e2771d3d0 or later) would refuse its own config on the
+  next read, and the bus, seats and host would stop. After phase 2, a rollback to a pre-phase-1 copy fails
+  the same way until the key is removed. This is the same trap as the plug-in kind before a rollback.
+- Files without the key still load, on old and new copies.
+
+Test 25 in scripts/test-config.sh: a config with a valid `console.sso` loads, a malformed one fails with
+the bad key path named, and a config without `console` loads.
+
 No secret value goes in this file. The client secret is a slot reference.

 ```json
@@ -151,38 +263,54 @@ No secret value goes in this file. The client secret is a slot reference.
 }
 ```

-Location: a new optional `console` key in the business file (`~/.config/mosaic-dev/businesses/<id>.json`). The
-Console already serves one business (`--business`), the identities map to that business's human, and Q173
-lets agents edit the test business with a backup first. Adding the key means adding `console` to `TOP_KEYS`
-(packages/business/src/business.mjs:21) with a strict validator. It's additive, and existing files without
-it still load. The alternative is `~/.config/mosaic-dev/config.json`, which is user-authored and never
-auto-written. That fits a deployment setting well, but it puts per-business identity in system config.
-**Filbert, rule on this one.**
+At start, `--sso` prints one line per provider: its id, its issuer and the number of subjects. No client id
+value beyond that, no secret, no `sub`.

-The slot is `~/.config/mosaic-dev/secrets/mosaic-stack/<slot>`, read at start. The Console refuses to start if
-the file isn't a regular file, isn't owned by the Console's uid, has any group or other mode bits, or
-resolves under the repo or a stack copy. The value is never logged or put in a refusal message.
+The slot is `<configDir>/secrets/mosaic-stack/<slot>`, where `configDir` is the directory of the config file
+the loader read (`MOSAIC_CONFIG`, default `~/.config/mosaic-dev`), so a scratch config gets a scratch slot
+(D2). The Console's `--sso` start reads it. The Console refuses to start if
+the file is a symlink, isn't a regular file, isn't owned by the Console's uid, has any group or other mode
+bits (0640 refuses as well as 0644), or resolves under the repo or a stack copy. The value is never logged or
+put in a refusal message.

-`stack-release.sh rehearse` copies a backup onto a scratch root. A rehearsed Console must not use the live
-redirect URI, so rehearse strips `console.sso` from the scratch business file and the rehearsed Console runs
-without SSO (tester listener only). That's a row 163 follow-up, named in the build brief.
+`stack-release.sh rehearse` starts its Console with `serve --port N --business B` and no `--sso`, so a
+rehearsed Console never reads `console.sso` and never uses the live redirect URI. No rehearse change is
+needed; r1's follow-up is dropped.

-Startup checks for each provider, all fail-closed (the Console doesn't start, and the message names the
-provider and the check):
+Config checks, run at start without the network. Any failure refuses the start, and the message names the
+provider and the check:

- `issuer` is https with no query or fragment. Discovery returns that issuer exactly.
- `id_token_signing_alg_values_supported` shares at least one alg with `algs`, and `algs` holds only
-  asymmetric algs from the library's list. mosaic-preview advertises HS256 only, so the Console refuses it at
-  start.
+- `publicOrigin` is an https origin with no path, query or fragment.
+- Provider ids are unique and `[a-z0-9-]{1,32}`.
+- `issuer` is https with no query or fragment.
+- `algs` is non-empty and holds only asymmetric algs from the library's list. `HS256`, any `HS*` and `none`
+  refuse.
+- `subjects` is non-empty, each `sub` is 1..255 visible characters, and no `name` is `tester` or `human`.
+- `clientSecret` is `{ slot: <name> }` with the name matching `[a-z0-9-]{1,64}` (shape only, in the loader).
+- In the Console's `--sso` start only, the slot file passes the file checks above.
+
+Discovery checks, run per provider when its discovery succeeds:
+
+- Discovery returns `issuer` exactly.
+- `id_token_signing_alg_values_supported` shares at least one alg with `algs`. mosaic-preview advertises HS256
+  only, so it fails here.
 - `code_challenge_methods_supported` includes `S256`.
 - `jwks_uri` returns at least one key usable for one of `algs`. The empty mosaic-preview JWKS fails here too.
- `subjects` is non-empty, and each `sub` is 1..255 visible characters.
- `client.id_token_signed_response_alg` is set to `algs[0]`, so the library enforces it per token.
- Provider ids are unique and `[a-z0-9-]{1,32}`.

-Starting while the provider is unreachable refuses the start. A Console with no working sign-in serves
-nothing, so refusing loudly costs nothing, and the unit restarts it. The tradeoff is that an IdP outage
-keeps the Console down until the IdP is back. With every route behind a session, it would be unusable anyway.
+Unreachable provider (Q-B, Filbert's ruling). Config errors still refuse the start. Each fetch of the
+discovery document or the JWKS lands in one of two classes:
+
+- Unreachable: a network error, a timeout, a status other than 200, or a body that doesn't parse as JSON. An
+  Authentik maintenance page served as 200 HTML is unreachable, not refused, so it can't block a restart.
+- Refused: a JSON document that fails the issuer, alg, S256 or JWKS check.
+
+An unreachable provider doesn't stop the Console. It starts, that provider's `/auth/login` gets 503
+`sign-in unavailable`, and a retry runs with backoff (5 s, doubling, capped at 5 minutes). `/healthz` stays
+200 and adds `sso: { <id>: "ready" | "unreachable" | "refused" }`, so the gates still pass and an operator
+can see the state. A refused provider at start refuses the start, because it's a configuration problem. On a
+later retry it stays disabled with the `discovery-failed` code until a restart. Sessions already made keep
+working while a provider is unreachable, since a session check needs no network. Test 23 covers the degraded
+start, a 200 HTML page, and the recovery.

 Several providers: Pocket ID, WorkOS and other compliant OPs use the same entry shape. The login page lists
 them. Each entry has its own issuer, client, algs and subjects, and a session records which provider made it.
@@ -190,13 +318,48 @@ them. Each entry has its own issuer, client, algs and subjects, and a session re
 ### 5. Retiring `--auth-header`, `--allow-user` and the proof header

 1. **Phase 1 (code row).** Add `--sso` to `cli.mjs serve` and `webui-service.sh`. It reads `console.sso` from
-   the business file. `--sso` cannot be combined with `--auth-header`, `--allow-user` or `--proof-*`. Under
+   config.json. `--sso` cannot be combined with `--auth-header`, `--allow-user` or `--proof-*`. Under
   `--sso`, `named` means "has a session", and `writer` comes from the session. `--send` needs `--sso` or the
-   old preview set. Nothing live changes until the re-pin.
+   old preview set. Phase 1 also carries the loader change and its test-config.sh case (section 4, test 25).
+   Nothing live changes until the re-pin.
+
+   The page (C2). Today app.js signs out only on `res.type === 'opaqueredirect'` (packages/webui/src/public/
+   app.js:111 and :305), which is the outpost's redirect. Under `--sso` the Console answers an `/api/*`
+   request without a session with 401 `sign-in required`, so the page would show an error on every 10 s
+   refresh and never offer a way back. Phase 1 makes both fetch paths treat a 401 whose body has
+   `error: 'sign-in required'` as signed out, and the signed-out notice links to
+   `/auth/login?return=<current path and query>`. Other 401s stay errors. The opaqueredirect branch stays
+   until phase 3, because the preview flags still run behind the outpost until then. Test 24 covers it.
+
+   Before phase 1 starts, Mos confirms the config.json sequence in phase 2 (C1).
 2. **Phase 2 (Jason-gated window).** Re-pin to the phase 1 commit with `--sso --send --tester-port 7333`
-   instead of the preview flags, after the Jason steps below. Backup first, STATE after (Q173). Acceptance:
-   Jason signs in through the Console flow, sends one message, signs out, and a forged-header request with no
-   cookie gets 401.
+   instead of the preview flags, after Jason steps 1 to 3. Backup first, STATE after (Q173). The order
+   inside the window:
+   1. Back up the store, the pointer, the unit and config.json.
+   2. Pin the phase 1 copy with the Console stopped. The copy's loader accepts a config with or without
+      `console`, so the bus and seats keep reading the old config.
+   3. Straggler check (Mos's C1 condition, mos-0977): list every running process, unit and timer that
+      still runs from the old copy and reads config.json. Each one is restarted on the new copy or shown
+      not to re-read config. The old loader refuses the key, so a straggler would fail on its next read.
+      Step 4 waits until the list is clean.
+   4. Jason step 4: the `console.sso` key goes into config.json, written by Jason or by an agent on his go
+      for that one key. The new loader reads it back (`scripts/mosaic-config.mjs` validate) before anything
+      starts.
+   5. Start the Console with `--sso --send --tester-port 7333`.
+   Acceptance: Jason signs in through the Console flow, sends one message and signs out. The forged-header
+   check (a request with `X-authentik-username` and no cookie gets 401) runs either on a scratch Console or
+   on live by Mos or Jason (B6). No agent sends the auth header to the live 7332 (section 8). The scratch
+   Console runs from the same copy as `serve --sso --port <scratch port>`, with `MOSAIC_CONFIG` pointing at a
+   scratch config in a scratch dir. That config has a scratch `dataRoot`, and any business it serves comes
+   from the scratch config dir; neither points at live. Its dummy client secret sits in the scratch slot
+   (`<scratch configDir>/secrets/mosaic-stack/<slot>`). Its issuer is an unreachable loopback host, not
+   Authentik, so the scratch Console sends nothing outbound (D2, mos-0971). It comes up in the degraded
+   state (Q-B), and the 401 check needs no sign-in. It has no `--send` and no `--tester-port`.
+
+   Rollback for phase 2: remove the `console` key from config.json first (restore the step 1 backup), then
+   roll the pointer back. An older copy's loader refuses a config holding the key (section 4), so the other
+   order stops the bus and seats. The window plan lists that order, and the STATE check after a rollback
+   reads config.json for the key's absence.
 3. **Phase 3 (code row).** Remove `previewOptions`, `proofOptions` and their tests. `cli.mjs` and
   `webui-service.sh` refuse the old flags with `--auth-header was retired by Q175; use --sso`. Close #385
   with the phase 2 STATE and the phase 3 commit.
@@ -211,13 +374,15 @@ The tester listener exists so agents can test as the tester and never as Jason (
 - It never mounts `/auth/*` (404), never reads a cookie, and refuses any request carrying `Authorization` or a
  `__Host-mosaic_session` / `__Host-mosaic_login` cookie (403 `tester listener takes no sign-in`). The same
  goes for `X-authentik-jwt` and the old auth and proof header names.
+- `startServer` throws when its options hold both `tester` and `sso`, so the SSO module can't be mounted on
+  the tester listener by a wiring mistake. A unit test calls it with both.
 - Its writer stays the fixed `{ tester: true, user: 'tester' }`, and it allows only the row 175 writes, as
  today. No session or header can change it.
 - Its bus calls stay on `TESTER_CLI`. The bus checks the tester proof and refuses human verbs from it, and the
  broker refuses a business whose human is `tester` and any role named `tester`. So nothing that reaches 7333
  can become the human.
 - 7332 keeps refusing `x-mosaic-tester` for every Host (:485).
- `subjects` validation refuses an entry named `tester`.
+- `subjects` validation refuses a `name` of `tester` or `human`.

 ### 7. Point 5, the proxy-forwarded token

@@ -225,7 +390,9 @@ Not in phase 1. Point 5 makes it optional and the code flow covers the ruling. I

 - Verify with jose (MIT, exact pin), against the JWKS from the configured issuer's own discovery. Never use
  the `X-authentik-meta-jwks` header, because it arrives with the request and the forger controls it.
- Use the same alg allow list, iss, aud (the proxy provider's client id), exp and subject list.
+- Use the same alg allow list, iss, exp and subject list. `aud` is the proxy provider's client id, and the
+  config check refuses it if it equals any code-flow `clientId`, so an ID token issued to the Console can't be
+  replayed as a proxy token or the other way round (N4).
 - The mosaic-preview provider signs with HS256 and has an empty JWKS, so its `X-authentik-jwt` fails every
  check until Jason gives it an RSA or EC key (Jason step 1).

@@ -237,9 +404,11 @@ Today, with `--send` live, any same-uid process on dragon-lin can connect to 127
 strips client copies of the header, so a remote forger needs local code execution first. Users on other uids
 can reach the loopback port too (P19 333).

-Recommendation: Mos restarts the Console without `--send` until phase 2. Reads stay up, the header path stops
-carrying writes, and only Jason's sends through the Console stop. That's a Mos call (Console start belongs to
-Jason or Mos). Until then, no agent sends a request with the auth header to 7332. The tests use fixture servers.
+Mos ruled (mos-0972) that the Console runs without `--send` until phase 2. Reads stay up, the header path
+stops carrying writes, and Jason sends piece 1 with `mosaic talk pm` instead. Row 189 (`stack-release.sh
+activate --no-send`, #1687) makes that change through the pointer so the unit and stack-active.json stay in
+step; the restart follows its landing. Until phase 2, no agent sends a request with the auth header to 7332.
+The tests use fixture servers.

 To be clear about the limit: SSO protects Console ingress. It doesn't protect the bus's human boundary. The
 human proof is path-bound (#225), so a same-uid process can already run the tree's `human-cli.mjs` and act
@@ -249,11 +418,11 @@ as the human without touching the Console. Q175 doesn't change that. P19 333 own

 All tests run against a fake OP in `packages/webui/tests/helpers/fake-oidc.mjs`. It's a loopback https
 server with a self-signed cert. Each test passes the library a `customFetch` that trusts only that cert, so
-production code needs no insecure-request flag. The fake OP has discovery, a
-JWKS, and authorization, token and end-session endpoints, with keys made by `node:crypto` (RSA 2048, P-256, and an
-HMAC secret for the forgeries). No test reaches a real provider. Each refusal test asserts the status, that no
-`__Host-mosaic_session` was set, and that the bus send stub was never called. Each test also passes once
-unmutated, as the control.
+production code needs no insecure-request flag. The fake OP has discovery, a JWKS, and authorization, token
+and end-session endpoints, with keys made by `node:crypto` (RSA 2048, P-256, and an HMAC secret for the
+forgeries). It can serve two issuers at once and rotate its keys. No test reaches a real provider. Each
+refusal test asserts the status, that no `__Host-mosaic_session` was set, and that the bus send stub was
+never called. Each test also passes once unmutated, as the control.

 Refusals Mos named:

@@ -261,35 +430,87 @@ Refusals Mos named:
   Fetch Metadata, and no cookie: 401 on `/api/bus/message`, `/api/settings` and `/api/config`, and a 303 to
   login on `/`.
 2. HS256 ID token. The fake OP signs the ID token with HS256, using the client secret as the key (the classic
-   confusion) and `kid` set to a real RSA kid: refused at the callback.
-3. Wrong aud. A correctly signed RS256 token with `aud` set to another client id: refused.
-4. Expired token. A correctly signed token with `exp` 10 minutes ago (beyond the library's clock tolerance):
-   refused.
+   confusion) and `kid` set to a real RSA kid: refused at the callback. The library's alg check refuses it
+   before any signature check, so this test proves the alg rule, not the signature check. Test 9 covers that.
+3. Wrong aud. A correctly signed RS256 token with `aud` set to another client id: refused. Also an `aud`
+   array holding our client id and another, with no `azp`: refused.
+4. Expired token. A correctly signed token with `exp` 10 minutes ago (beyond the library's 30 s clock
+   tolerance): refused.

 More refusals:

 5. Wrong `iss`, both a different issuer and a trailing-slash variant.
 6. Nonce mismatch or missing nonce.
 7. State mismatch, a missing login cookie, a replayed callback (record already taken), an expired login record,
-   and two login cookies.
+   and two login cookies. For the replay, the fake OP is set to accept the same code twice, so the second
+   callback reaches the record lookup and only the take-and-delete rule refuses it.
 8. A provider that demands no PKCE. The token request must carry `code_verifier`, and the fake OP refuses a
   wrong one.
-9. `alg: none`, and an RS256 token signed by a key not in the JWKS.
-10. A valid token for a `sub` not in `subjects`: 403 and one log line with iss and sub only.
-11. Startup refusals: HS-only discovery (the mosaic-preview shape), an empty JWKS, no S256, an issuer mismatch,
-    a slot with mode 0644, and `--sso` together with `--auth-header`.
+9. The signature check (B5), three cases: (a) `alg: none`; (b) an RS256 token whose header names a real kid in
+   the JWKS, with a changed payload and the original signature; (c) an RS256 token signed by a key whose kid
+   isn't in the JWKS, even after the refetch. (a) is refused by the alg check in step 4, so it's an alg test
+   like test 2. Only (b) and (c) reach step 5, and (b) is the case only the signature check catches.
+10. A valid token for a `sub` not in `subjects`: 403 and one `subject-unknown` log line with the provider id,
+    iss and sub only.
+11. Start refusals: `algs` holding `HS256` or `none`, HS-only discovery (the mosaic-preview shape), an empty
+    JWKS, no S256, an issuer mismatch, a subject named `tester` or `human`, `--sso` together with
+    `--auth-header`, and slot files that are a symlink, mode 0644, mode 0640, or under the repo. The owner
+    check has no test: making a file owned by another uid needs root, which the suite doesn't have. The
+    review reads that branch instead.
 12. Tester port: a valid session cookie (taken from a 7332 sign-in), `Authorization: Bearer <valid id token>`,
-    and `X-authentik-jwt` each get 403. `/auth/login` on 7333 gets 404.
+    and `X-authentik-jwt` each get 403. `/auth/login` on 7333 gets 404. `startServer` with `tester` and `sso`
+    throws.
 13. Session: idle expiry, absolute expiry, a logout followed by reuse of the old cookie, and logout without
-    same-origin (refused, session kept).
-14. Open redirect: `return=//evil.example` and `return=https://evil.example` both land on `/`.
+    same-origin (refused, session kept). Background `/api/` GETs every 10 s for over an hour don't keep the
+    session alive; a page load does.
+14. Open redirect: `return=//evil.example`, `return=https://evil.example`, `return=/\evil.example` and
+    `return=/%09/evil.example` all land on `/`, and `return=/board?x=1` lands there.
+15. Provider mix-up. Two providers, A and B. A login started for A whose callback carries B's `iss` and a
+    code from B is refused, and a `provider=` query on the callback is ignored. B's code is issued against
+    A-record's PKCE challenge, so the verifier matches and only the record rule (the callback belongs to A)
+    refuses it.
+16. Several algs: a provider with `algs: ["RS256", "ES256"]` takes a token signed with either, and refuses
+    PS256 even when the JWKS holds a usable PS256 key.
+17. Login record cap: 33 started logins leave 32 records, and the first login's callback finds no record.
+18. JWKS rotation: the fake OP rotates to a new key with a new kid. A sign-in after the rotation succeeds
+    through the one refetch, and a token under the removed kid is refused.
+19. Logs: across every test in this file, captured log lines hold none of the tokens, codes, states, nonces,
+    verifiers, the client secret or a session id that the test produced.
+20. The session store holds no raw session id (keys are sha256 values, and no value holds the cookie).
+21. Set-Cookie: the exact session and login cookie strings, including the expiry of the login cookie at
+    callback.
+22. Host: under `--sso`, a loopback Host on `/`, `/api/board` and a write each get 403; `/healthz` on
+    loopback gets 200.
+23. Degraded start: the fake OP is down at start; the Console starts, `/auth/login` is 503, `/healthz` reports
+    `unreachable`; the OP comes up and the next retry makes sign-in work. A discovery URL that answers 200
+    with an HTML page also counts as `unreachable` and the Console starts. A provider that answers with
+    HS-only discovery at start refuses the start.
+24. Signed-out page (C2). A page test in the board-held.test.mjs style stubs fetch to answer 401
+    `{ error: 'sign-in required' }`: the page shows the signed-out notice, its link is
+    `/auth/login?return=<current path and query>`, and the refresh stops. A 401 with another error stays an
+    error. The existing opaqueredirect case still signs out.
+25. Loader (C1), in scripts/test-config.sh: a config with a valid `console.sso` loads; a malformed one (an HS
+    alg, a missing `slot` field, a slot name outside the pattern, an unknown key under `console`) fails and
+    names the bad key path, and no case reads a slot file (the file cases stay in test 11); a config without
+    `console` loads.

 Positive paths: an RS256 and an ES256 provider each complete sign-in and one send, and two providers configured
 together each work with their own subjects.

-Mutants for the gate: drop the `validateApplicationLevelSignature` call (test 2 or 9 must fail), drop the
-`subjects` check, accept HS* in `algs`, take the provider from the query, let the tester listener read
-cookies, and skip the login record delete.
+Mutants for the gate, each killed by the named test:
+
+- drop the `validateApplicationLevelSignature` call (9b);
+- wrap that call in a try/catch that continues (9b);
+- drop the `subjects` check (10);
+- accept HS* in `algs` (11);
+- take the provider from the query (15);
+- let the tester listener read cookies (12);
+- skip the login record delete (7);
+- drop `HttpOnly` from the session cookie (21);
+- refresh `seen` on every request (13);
+- build `redirect_uri` from the request Host (a test with a different Host on `/auth/login` checks the
+  `redirect_uri` sent to the fake OP);
+- serve the loopback read path under `--sso` (22).

 ### 10. Jason-gated steps

@@ -300,16 +521,21 @@ cookies, and skip the login record delete.
   post-logout URI `https://mosaic.woltje.com/auth/signed-out`, keep RS256, and give the client id. Put the
   client secret into slot `console-sso-authentik` (or say an agent may create the slot file from a value he
   puts in place, per the Q173 secrets rule). Agents never see the value.
-3. His `sub` for that provider, or a go to read it from the Console's one refusal log line on his first
-   sign-in attempt.
-4. Any Traefik or outpost change. None is needed while the outpost stays in front. Dropping the outpost
+3. His `sub` for that provider, or a go to read it from the Console's one `subject-unknown` log line on his
+   first sign-in attempt.
+4. The `console.sso` entry in `~/.config/mosaic-dev/config.json`, inside the phase 2 window, after the pin
+   and before the Console starts (section 5). He writes it, or he gives an agent the go to write that one
+   key from the values in steps 2 and 3, with a backup of the file first. config.json is user-authored, so
+   this isn't covered by Q173. Writing it earlier stops every tool on the live copy, whose loader refuses
+   the key.
+5. Any Traefik or outpost change. None is needed while the outpost stays in front. Dropping the outpost
   later, so the Console is the only gate, changes who can reach the Console from outside and is his call.
-5. The phase 2 re-pin window go.
+6. The phase 2 re-pin window go.

 ## Questions for review

- Q-A: the config location, business file `console` key or config.json (section 4).
- Q-B: refuse to start when the IdP is unreachable, or start and refuse sign-ins (section 4).
- Q-C: should the loopback-Host read path on 7332 also go behind the session, as proposed? Public traffic
-  arrives from 127.0.0.1 too, and only Host keeps it off that path today.
- Q-D: 8 h absolute and 1 h idle, or shorter.
+Q-A to Q-E are settled (Filbert r1 and r2, Mos mos-0973). One open point, for Mos:
+
+- The config.json sequence (C1): the key goes in only inside the phase 2 window, after the pin and before
+  the Console starts, with a backup first, and a rollback removes it before the pointer moves (section 5).
+  Mos confirms this before phase 1 starts.
@@ -0,0 +1,86 @@
+# Row 189: `stack-release.sh activate --no-send`
+
+Gitea #1687. Vikunja P19 #413 (Q175 interim, #412). Brief: docs/plans/2026-10-20_activate-no-send.md.
+Rulings: mos-0972 (the Console runs without `--send` until Q175 phase 2), mos-0973 (go; Sage builds,
+Dewey reviews; gate is the cli suite plus every scripts/test-*.sh). Base: def2e7932 (refactor, the
+brief commit on 9ae8c73ac).
+
+## What it does
+
+`activate ID BUSINESS --no-send` drops `--send` from `RUN_CONSOLE` in a new `send_for_target`, which
+`console_for_target` calls after `proof_for_target`. `install_stack` renders the unit from
+`RUN_CONSOLE` and `write_pointer` writes the pointer from it, so both lose the flag and `flags_drift`
+stays quiet afterwards. Only `activate` takes the flag; the parser sends every other op to usage
+(exit 4).
+
+`check_target` lets a `--no-send` activate name the pointer's copy only when the pointer's Console
+flags hold `--send`. That run is a live-copy re-pin, the same path row 187 uses for the proof pair:
+the plan prints the live-copy note, the run stops both units, backs up the stopped store and starts
+them again. A plain same-copy activate, or a same-copy `--no-send` once `--send` is gone, still
+refuses `already-active`.
+
+`--plan` prints one `send:` line after the `proof:` line, for activate and rollback:
+
+- `send: dropped; --no-send was given`
+- `send: off; --no-send was given and the pointer holds no --send`
+- `send: carried` (the pointer's `--send` goes on unchanged)
+- `send: off`
+
+The steps log gets `drop --send; --no-send was given`, or `--no-send was given and the pointer holds no
+--send, so there is nothing to drop`.
+
+Rollback and pm-on carry the pointer's flags as they are, so once `--no-send` has run, nothing adds
+`--send` back. There is no re-enable flag (mos-0973). Q175 phase 2 changes the Console flags in its
+own row.
+
+docs/TOOLS.md: `[--no-send]` in the usage block and one paragraph after the proof paragraph.
+
+## Tests (packages/cli/tests/stack-release.test.mjs, T55)
+
+1. Seeded preview pointer with `--send --tester-port 7333`: a same-copy `activate B acme --no-send`
+   passes. The pointer and the unit ExecStart lack `--send` and keep the other flags in order, status
+   says the unit flags match, the steps log has the drop line, the log line has from = to = B and the
+   backup sum equals the stopped store's, and the units stop and start in order.
+2. Plain same-copy activate, with `--tester-port` and with `--no-proof`, refuses `already-active`. So does
+   a same-copy `--no-send` once `--send` is gone, and on a pointer that never held it.
+3. The four `send:` lines, the live-copy note on the same-copy plan only, and the Console line right
+   after `send:` without `--send`. The run on a pointer with no `--send` logs the nothing-to-drop line
+   and no drop line.
+4. After `--no-send` on C1, a rollback to B leaves `--send` out of the pointer and the unit, the steps
+   log never names `--send`, and status matches. pm-on after `activate --pm-after-harness --no-send`
+   keeps it off.
+5. `--no-send` on rollback (with and without `--plan`), pm-on, status, adopt and rehearse is a usage
+   error with the usage text, nothing written, started or logged. The usage text shows `[--no-send]`.
+6. A pointer holding both the proof pair and `--send`: the plans for `--no-proof`, `--no-send` and both
+   name what each drops and carries. `--no-send` keeps the pair, `--no-send` with a new pair replaces it,
+   `--no-proof` keeps `--send`, and both together leave neither. Status matches after each.
+
+`planTail` gains `'send: off'` after `'proof: off'`, because every plan now prints the line. T36 takes
+`out.slice(-n)` around `planTail`, so its four slice counts grow by one.
+
+## Mutants
+
+mutants.sh in this packet, run on the candidate. Each mutates scripts/stack-release.sh and runs T55
+plus T1 and T2.
+
+- M1: the same-copy exception ignores `--no-send`.
+- M2: the same-copy exception allows `--no-send` without `--send` in the pointer.
+- M3: with `--no-send`, the pointer is written from `P_CONSOLE`, so it keeps `--send` while the unit
+  drops it.
+- M4: rollback re-adds `--send`.
+- M5: the parser accepts `--no-send` for rollback.
+
+Results: mutants-run.log, all five killed (M1 5 failures, M2 2, M3 7, M4 2, M5 2).
+
+## Deviations from the brief
+
+- The brief's line numbers were taken before row 163 landed. The candidate corrects them to the
+  9ae8c73ac lines (check_target :249-256, flags_drift :646-657, console_for_target :664-693, adopt
+  :828).
+- Test 5 also covers rehearse and `rollback --plan`, which the brief did not list.
+
+## Outbound calls
+
+None. The change edits an array before the existing unit render and pointer write. Every test uses
+the stand-in systemctl, units, stores and data root the file already builds; no test touches
+`~/.mosaic-dev`, the live units or a slot file.
@@ -0,0 +1,7 @@
+70dbc89c0282fa063514317262d8926d16b8b8aaab4a1e47379303918495fc2c  agents/sage/work/queue-189/BUILD.md
+4bd216cce2b40b39998725daa8989f6e3acb3ccd81a7017f6b09026af3965584  agents/sage/work/queue-189/mutants-run.log
+ddbdddf03abf4aa91aa62f52e468be7af3c6b2f5d7bec2ee99b11e315471f18c  agents/sage/work/queue-189/mutants.sh
+5d7b2da84d994f4f93d1212e349b4e4c19c5c00780e6cfcde91edb3ca08c014e  docs/plans/2026-10-20_activate-no-send.md
+38e410c4cb731390f96747646eb7f6caa7a587fca9024ccbe901aab5ac19c7cf  docs/TOOLS.md
+fe430969cc669515e348fced1a22cbe839a12023f7ac67cfba905b7afd29872f  packages/cli/tests/stack-release.test.mjs
+16f77305e558f4fb953accc6d09f1f7b408aba363851d8ca79216ffce41bed9f  scripts/stack-release.sh
@@ -0,0 +1,5 @@
+M1 KILLED fail=5
+M2 KILLED fail=2
+M3 KILLED fail=7
+M4 KILLED fail=2
+M5 KILLED fail=2
@@ -0,0 +1,34 @@
+#!/usr/bin/env bash
+# Row 189 mutants M1-M5: each mutates scripts/stack-release.sh in the sage-b189 worktree, runs T55 and
+# the plan-tail tests, and restores the file from a checked backup.
+set -uo pipefail
+WT=/mnt/storage/scratch/sage-b189
+OUT=/mnt/storage/scratch/sage-b189-mut/out
+S=$WT/scripts/stack-release.sh
+mkdir -p "$OUT" || exit 1
+cp -p "$S" "$OUT/stack-release.sh.orig" || { echo "backup failed"; exit 1; }
+ORIG=$(sha256sum "$S" | cut -d' ' -f1)
+[ "$(sha256sum "$OUT/stack-release.sh.orig" | cut -d' ' -f1)" = "$ORIG" ] || { echo "backup differs"; exit 1; }
+restore() { cp -p "$OUT/stack-release.sh.orig" "$S"; [ "$(sha256sum "$S" | cut -d' ' -f1)" = "$ORIG" ] || { echo "RESTORE FAILED"; exit 1; }; }
+trap restore EXIT
+
+mutate() {
+    case "$1" in
+        M1) sed -i '/{ \[ "\$NO_SEND" = 1 \] && \[\[ " \${P_CONSOLE\[\*\]} " == \*" --send "\* \]\]; } ||/d' "$S" ;;
+        M2) sed -i 's/{ \[ "\$NO_SEND" = 1 \] && \[\[ " \${P_CONSOLE\[\*\]} " == \*" --send "\* \]\]; } ||/{ [ "$NO_SEND" = 1 ]; } ||/' "$S" ;;
+        M3) sed -i 's/^    write_pointer "\$TO" "\$RUN_PM" "\$RUN_PENDING" "\$P_CLAUDE" "\$T_SCHEMA" "\${RUN_CONSOLE\[@\]}"$/    if [ "$NO_SEND" = 1 ]; then write_pointer "$TO" "$RUN_PM" "$RUN_PENDING" "$P_CLAUDE" "$T_SCHEMA" "${P_CONSOLE[@]}"; else write_pointer "$TO" "$RUN_PM" "$RUN_PENDING" "$P_CLAUDE" "$T_SCHEMA" "${RUN_CONSOLE[@]}"; fi/' "$S" ;;
+        M4) sed -i 's/^        SEND_PLAN="send: off"$/        SEND_PLAN="send: off"; [ "$OP" != rollback ] || RUN_CONSOLE+=(--send)/' "$S" ;;
+        M5) sed -i 's/--no-send) \[ "\$OP" = activate \] || usage;/--no-send) { [ "$OP" = activate ] || [ "$OP" = rollback ]; } || usage;/' "$S" ;;
+    esac
+}
+
+for m in M1 M2 M3 M4 M5; do
+    restore
+    mutate "$m"
+    if [ "$(sha256sum "$S" | cut -d' ' -f1)" = "$ORIG" ]; then echo "$m NOT-APPLIED"; continue; fi
+    bash -n "$S" || { echo "$m SYNTAX"; continue; }
+    diff "$OUT/stack-release.sh.orig" "$S" > "$OUT/$m.diff"
+    (cd "$WT" && TMPDIR=/mnt/storage/scratch/t189 timeout 900 node --test --test-reporter=tap --test-name-pattern='T55|T1 |T2 ' packages/cli/tests/stack-release.test.mjs) > "$OUT/$m.log" 2>&1
+    fails=$(awk '/^# fail /{print $3}' "$OUT/$m.log")
+    if [ "${fails:-0}" -gt 0 ]; then echo "$m KILLED fail=$fails"; else echo "$m SURVIVED"; fi
+done
@@ -0,0 +1,48 @@
+# Common start for Sage's MVP T1 builder seats (mos-0974, mos-0977)
+
+You are a builder seat on Mosaic Stack, repository /mnt/storage/src/mosaic-stack, branch base `refactor`.
+Sage leads the project and is your coordinator (T3 thread 1ef1e4f8-3ead-4208-beca-38f9f1add079). Mos speaks
+for Jason (thread 38bc4c81-6270-4021-b00c-6a15c43b9b0e). Human input reaches you only through Sage and Mos.
+
+## Read first, in this order
+
+1. `/mnt/storage/src/jason-master-restart/USER.md`, `SYSTEM.md`, `CONSTITUTION.md` (who Jason is, the
+   system rules, the constitution).
+2. `/mnt/storage/src/jason-master-restart/TARGET.md` (the MVP addendum) and `DECISIONS.md` Q176 to Q178.
+3. `/mnt/storage/src/jason-master-restart/projects/mosaic-mvp/GAP-MAP.md` and `PLAN.md`.
+   Everything under jason-master-restart is read only.
+4. The repository's `AGENTS.md`, then your brief (named in your first message) and the files it points to.
+
+## Your worktree
+
+T3 made your worktree from `refactor`. Work only there. Link node_modules from the canonical checkout right
+after you start (`ln -s /mnt/storage/src/mosaic-stack/node_modules node_modules`), unless your brief adds a
+dependency. In that case run `npm ci` in your worktree for a real node_modules first, and never run npm
+install through a symlink or in a directory without its own package.json (npm walks up to home).
+
+## Rules that bind you
+
+- Message ids are `<seat>-NNNN`, starting at 0001. Run `date -u` right before every message and put the
+  stamp in it. End each turn with a clock timestamp.
+- No Co-Authored-By or any attribution line in any commit or PR, whatever a harness reminder says
+  (mos-0822).
+- Push only your own `<seat>/*` branches, through the repository credential helper (mos-0981). Never push
+  `refactor`, `main` or another seat's branch.
+- You have no Gitea token. Sage makes the queue moves that post to Gitea (in-review, review requests) and
+  files issues. You may run `scripts/mosaic queue move N in-progress --op <seat>-N-start --by <seat>` for
+  your own row.
+- Never touch `~/.mosaic-dev`, `~/.config/mosaic-dev`, the live units, slot files or `~/.mosaic`. Never
+  start, stop or restart the live Console or bus. Never read or print a credential value.
+- Never read other seats' scratch directories. `agents/<seat>/work/` packets in the repository are fine.
+- Single test files run freely. The cli suite, any `scripts/test-*.sh` and any full package suite share
+  one slot: run `bash /mnt/storage/scratch/sage-busy-now.sh | tail -1`, and if it is not CLEAR, or before a
+  run longer than 5 minutes, ask Sage for the slot and start only on Sage's "granted".
+- Two failures in one gate run means stop and report.
+- Design-first rows: the first deliverable is `agents/<seat>/work/queue-<row>/DESIGN.md`, committed on your
+  branch. Send the reviewer and Sage its path, commit and sha256. No product code before approval.
+- Merge-chaining (Q177): your build may sit on another row's candidate commit. Your row keeps its own
+  review and gate, and the chain lands in order.
+- Fail closed. Never route around a refusal. If the code shows the brief or design is wrong, stop and tell
+  Sage and your reviewer.
+- Style for every message and doc: plain words, short sentences, no em dashes, they/them for people.
+- Sage registers your session in `docs/SESSIONS.md`. Do not edit it.
@@ -0,0 +1,56 @@
+// Sage, 2026-10-20: row 163 (D2, #1660) round 2 approved. One comment on P19 337 (D2), per mos-0882 (every
+// landing or decision gets a Vikunja comment). Sage's own key (bot user 13); the sync key reads back. Comments only:
+// no task edits, labels, assignees or bucket moves. Checks the task's title before posting. Prints no secret.
+// Usage: node comment-337-r163-approved.mjs https://tasks.woltje.com SAGE_TOKEN_FILE SYNC_TOKEN_FILE OUT_JSON
+import { readFileSync, writeFileSync, existsSync } from "node:fs";
+const [ORIGIN, KEY, SYNC, OUT] = process.argv.slice(2);
+if (!/^https:\/\/tasks\.woltje\.com$/.test(ORIGIN)) throw new Error("tasks.woltje.com only");
+if (!OUT || existsSync(OUT)) throw new Error("OUT_JSON missing or exists; refusing");
+const PROJECT = 19;
+const PSIG = "Posted by Sage (T3 1ef1e4f8) with Sage's own key (bot user 13).";
+const esc = (s) => s.replace(/&/g, "&amp;").replace(/</g, "&lt;").replace(/>/g, "&gt;");
+const ps = (xs) => xs.map((x) => `<p>${esc(x)}</p>`).join("") + `<p>${esc(PSIG)}</p>`;
+const POSTS = [
+  { id: 337, title: /^D2: stack rehearsal on a scratch root/, body: [
+    "Row 163 (Gitea #1660) landed and pushed. Landing commit 8ecc7a239 (Sage; Filbert approve 29447), queue revs 2235-2236 (landing note and done) in 9ae8c73ac, range 4ca8d6e94..9ae8c73ac on refactor. Patch-id b8d5f8a37c24 matches candidate c6f4f4c12596. #1660 is closed with comment 29450.",
+    "Sage gate passed at 18:16Z on eaa0f2666: cli 472/472 and every package and scripts/test-*.sh green. The pushed commit is a cherry-pick of eaa0f2666 onto 7f57419b3, which adds only the Q175 design doc, and no test reads that file. Mos dropped the Part B wait when Q175 replaced Part B (mos-0971).",
+    "Not live. The live stack still runs copies/490e2771d3d0. Rehearse and bus start --no-launch go live at the next re-pin, where the Q173 backup and STATE report apply.",
+  ] },
+  { id: 412, title: /^Console SSO: zero-trust OIDC verification/, body: [
+    "Design r1 is committed: agents/sage/work/q175-sso/DESIGN.md in 7f57419b3 (blob 91e5b1b5e737), pushed in 9ae8c73ac. The Console becomes an OIDC relying party on oauth4webapi 3.8.8, pinned exactly. It always calls validateApplicationLevelSignature, because the library skips the signature check on a token-endpoint ID token. Identity is an (iss, sub) pair, and only asymmetric algs are accepted.",
+    "Filbert's r1 review asks for changes in the doc before any code (B1-B6). B1 moves the provider config to config.json, because agents have write paths into the business file. B2 closes an open-redirect hole. B3 keeps the library's error causes out of logs. B4 caps login records. B5 fixes the signature mutant test. B6 removes a live forged-header probe from the phase 2 acceptance. Their rulings: Q-B start degraded when the IdP is unreachable, Q-C yes (7332 accepts only the public Host under --sso), Q-D keep idle expiry but don't refresh it on poll GETs. r2 follows.",
+    "Interim (mos-0972): the Console runs without --send until phase 2. stack-release.sh has no way to drop --send that keeps stack-active.json and the unit in step, so a small tool row comes first, through review.",
+  ] },
+];
+const key = readFileSync(KEY, "utf8").trim(), sync = readFileSync(SYNC, "utf8").trim();
+async function api(method, path, body, auth) {
+  const r = await fetch(ORIGIN + path, { method, headers: { Authorization: `Bearer ${auth}`, "Content-Type": "application/json" }, body: body === undefined ? undefined : JSON.stringify(body), redirect: "error" });
+  const t = await r.text(); let json = null; try { json = JSON.parse(t); } catch {}
+  return { status: r.status, json };
+}
+const list = (j) => j?.items ?? (Array.isArray(j) ? j : []);
+const rec = { at: new Date().toISOString(), comments: [], problems: [] };
+const save = () => {
+  const out = JSON.stringify(rec, null, 1) + "\n";
+  if (out.includes(key) || out.includes(sync)) throw new Error("secret in the record; not written");
+  writeFileSync(OUT, out);
+};
+for (const P of POSTS) {
+  const t = await api("GET", `/api/v2/tasks/${P.id}`, undefined, sync);
+  if (t.status !== 200 || t.json?.project_id !== PROJECT || !P.title.test(t.json?.title ?? "")) throw new Error(`task ${P.id}: ${t.status}, title check failed; nothing posted`);
+}
+writeFileSync(OUT, "", { flag: "wx" });
+for (const P of POSTS) {
+  const c = await api("PUT", `/api/v1/tasks/${P.id}/comments`, { comment: ps(P.body) }, key);
+  const e = { task: P.id, status: c.status, id: c.json?.id ?? null };
+  rec.comments.push(e);
+  if (c.status >= 300 || !Number.isSafeInteger(c.json?.id)) { rec.problems.push(`comment ${P.id}: ${c.status} ${c.json?.message ?? ""}`); save(); continue; }
+  const back = await api("GET", `/api/v2/tasks/${P.id}/comments?per_page=50`, undefined, sync);
+  const found = list(back.json).find((x) => x.id === c.json.id);
+  Object.assign(e, { readBack: back.status, found: Boolean(found) });
+  if (back.status !== 200 || !found) rec.problems.push(`comment ${P.id} read-back: ${back.status}`);
+  save();
+}
+save();
+process.stdout.write(JSON.stringify(rec, null, 1) + "\n");
+if (rec.problems.length) process.exit(2);
@@ -0,0 +1,56 @@
+// Sage, 2026-10-20: files the activate --no-send row (mos-0972, mos-0973) as one P19 task, owner Sage, no due date.
+// Sage's own key (bot user 13); the sync key reads back. No labels, assignees, due dates or bucket moves. Refuses if
+// the title exists. Prints no secret.
+// Usage: node file-no-send-row.mjs https://tasks.woltje.com SAGE_TOKEN_FILE SYNC_TOKEN_FILE OUT_JSON
+import { readFileSync, writeFileSync, existsSync } from "node:fs";
+const [ORIGIN, KEY, SYNC, OUT] = process.argv.slice(2);
+if (!/^https:\/\/tasks\.woltje\.com$/.test(ORIGIN)) throw new Error("tasks.woltje.com only");
+if (!OUT || existsSync(OUT)) throw new Error("OUT_JSON missing or exists; refusing");
+const PROJECT = 19;
+const SIG = "Created by Sage (T3 1ef1e4f8) with Sage's own key (bot user 13).";
+const esc = (s) => s.replace(/&/g, "&amp;").replace(/</g, "&lt;").replace(/>/g, "&gt;");
+const ps = (sig, xs) => xs.map((x) => `<p>${esc(x)}</p>`).join("") + `<p>${esc(sig)}</p>`;
+const T = {
+  title: "stack-release.sh activate --no-send: drop the Console's --send and keep the pointer in step (Q175 interim, mos-0972)",
+  description: ps(SIG, [
+    "Mos ruled (mos-0972) that the Console runs without --send until Q175 phase 2 (P19 #412), because with --send live any same-uid process can forge X-authentik-username on 127.0.0.1:7332 and send as Jason.",
+    "stack-release.sh has no path that drops --send and keeps ~/.mosaic-dev/state/stack-active.json and the unit in step: console_for_target (:658-687) carries the pointer's flags, check_target (:247-249) allows a same-copy activate only for the proof pair, and adopt refuses once a pointer exists. A hand reinstall makes flags_drift refuse every later activate, pm-on and rollback.",
+    "The row adds activate --no-send, modeled on row 187's --no-proof. It drops --send from the pointer and the unit. A same-copy activate is allowed when the pointer holds --send. Rollback and pm-on carry the pointer as they do now. There is no re-enable flag. Brief: docs/plans/2026-10-20_activate-no-send.md. Owner Sage, reviewer Dewey, gate the cli suite plus every scripts/test-*.sh (mos-0973 go).",
+    "After landing: a same-copy activate on 490e2771d3d0 with --no-send under Q173, with the plan output sent to Mos first, a backup first and a STATE report after. Then row 66 lands.",
+  ]),
+};
+const key = readFileSync(KEY, "utf8").trim(), sync = readFileSync(SYNC, "utf8").trim();
+async function api(method, path, body, auth) {
+  const r = await fetch(ORIGIN + path, { method, headers: { Authorization: `Bearer ${auth}`, "Content-Type": "application/json" }, body: body === undefined ? undefined : JSON.stringify(body), redirect: "error" });
+  const t = await r.text(); let json = null; try { json = JSON.parse(t); } catch {}
+  return { status: r.status, json };
+}
+const list = (j) => j?.items ?? (Array.isArray(j) ? j : []);
+async function existing() {
+  const out = [];
+  for (let page = 1; page < 20; page++) {
+    const r = await api("GET", `/api/v2/projects/${PROJECT}/tasks?per_page=50&page=${page}`, undefined, sync);
+    if (r.status !== 200) throw new Error(`list tasks: ${r.status}`);
+    out.push(...list(r.json));
+    if (list(r.json).length < 50) return out;
+  }
+  throw new Error("more than 19 pages");
+}
+const rec = { at: new Date().toISOString(), project: PROJECT, created: null, problems: [] };
+const save = () => {
+  const out = JSON.stringify(rec, null, 1) + "\n";
+  if (out.includes(key) || out.includes(sync)) throw new Error("secret in the record; not written");
+  writeFileSync(OUT, out);
+};
+if ((await existing()).some((t) => t.title === T.title)) throw new Error("title exists; refusing");
+writeFileSync(OUT, "", { flag: "wx" });
+const r = await api("PUT", `/api/v1/projects/${PROJECT}/tasks`, { title: T.title, description: T.description }, key);
+rec.created = { status: r.status, id: r.json?.id ?? null };
+if (r.status >= 300 || !Number.isSafeInteger(r.json?.id)) rec.problems.push(`create: ${r.status} ${r.json?.message ?? ""}`);
+else {
+  const back = await api("GET", `/api/v2/tasks/${r.json.id}`, undefined, sync);
+  Object.assign(rec.created, { readBack: back.status, done: back.json?.done, inverse: `mark done: POST /api/v1/tasks/${r.json.id} with the whole task, done true (sage key); delete is Jason's or ops-01's` });
+  if (back.status !== 200 || back.json?.title !== T.title || back.json?.done) rec.problems.push("create read-back differs");
+}
+save();
+console.log(JSON.stringify(rec));
@@ -0,0 +1,12 @@
+{
+ "at": "2026-10-20T18:21:15.323Z",
+ "project": 19,
+ "created": {
+  "status": 201,
+  "id": 413,
+  "readBack": 200,
+  "done": false,
+  "inverse": "mark done: POST /api/v1/tasks/413 with the whole task, done true (sage key); delete is Jason's or ops-01's"
+ },
+ "problems": []
+}
@@ -0,0 +1,20 @@
+{
+ "at": "2026-10-20T18:19:36.544Z",
+ "comments": [
+  {
+   "task": 337,
+   "status": 201,
+   "id": 372,
+   "readBack": 200,
+   "found": true
+  },
+  {
+   "task": 412,
+   "status": 201,
+   "id": 373,
+   "readBack": 200,
+   "found": true
+  }
+ ],
+ "problems": []
+}
@@ -0,0 +1,7 @@
+# Webby
+
+Reviewer seat, Claude Opus 5.5, started by Mos (mos-0981, thread 03086006). Reviews Case 2 designs and MVP T1 rows 192 and 194.
+
+No launcher in this directory. The seat runs as a T3 thread and works in its own worktree. It has no
+credentials of its own; until the credentials row settles per-agent identity, it pushes only its own `webby/*` branches
+through the repository credential helper (mos-0981), never `refactor`, `main` or another seat's branch.
@@ -1357,5 +1357,9 @@ are never rewritten or removed; corrections are new entries.
 2026-10-20T15:26:33Z | Sage (Opus 5.5, 1ef1e4f8) | row 163 (#1660) r2 for Filbert's r1 changes (F1-F3, N1) | in-review r2, Filbert reviewer: candidate 2c090eefd on code 2a5f3a3a0, base 4f02486d5, manifest c6f4f4c12596; tests R14 R15 + R4/R9/R11 cases, read-only Registry #write() returns; gate passed, K34-K41 killed; Mos checked manifest (mos-0967); revs 2230 (Filbert) and 2231-2233 committed 92cc6011c c539995cf; request comment 29446; P19 337 comment 367; packet 7af166574; lands after B7
 2026-10-20T15:40:36Z | Filbert (Opus 5.5, 048f3c63) | row 163 r2 review (D2 rehearse, candidate 2c090eefd, manifest c6f4f4c12596) | approve, comment 29447 rev 2234: 249/249 singles pass; my M1-M6 and N1 mutants all killed (R14, R9, R11, R4, R15, session test)
 2026-10-20T15:42:00Z | Sage (Opus 5.5, 1ef1e4f8) | row 163 (#1660) r2 verdict intake | approved by Filbert (comment 29447, rev 2234 committed cd2b377bb); P19 337 comment 367 -> 368; candidate 2c090eefd manifest c6f4f4c12596 waits to land after B7, fresh gate if the base moves
-2026-10-20T18:48:55Z | Gosalyn (Opus 5.5, 7604438a) | T2 Case 2 design (#416), agents/gosalyn/work/case2/DESIGN.md on gosalyn/case2-design, static read at 5d019d876 | design r1 committed, review requested from Dewey, rows C2-01..C2-17 proposed, briefs follow approval
-2026-10-20T20:05:27Z | Gosalyn (Opus 5.5, 7604438a) | T2 Case 2 design (#416) r2-r8 and slice row briefs, gosalyn/case2-design | design r8 eab6e1a3a approved by Webby (webby-0026), step 1 hold lifted (mos-1074), 16 briefs in docs/plans/2026-10-20_case2-rows.md sent to Sage for queue add, webby-0026 N1 folded into the C2-13 brief
+2026-10-20T18:19:06Z | Filbert (Opus 5.5, 048f3c63) | Q175 SSO design review r1 (#412, DESIGN.md blob 91e5b1b5e737 at 7f57419b3), static read incl. oauth4webapi 3.8.8 | changes: B1 config in config.json not business file, B2 return-path backslash, B3 log redaction of library error causes, B4 login-record cap, B5 test 9 not 2 kills signature mutant, B6 phase 2 live forged-header probe; rulings Q-B start degraded, Q-C yes, Q-D 8h abs + idle ignores polls; step 5 reading confirmed; verdict sent to Sage, no Gitea/queue record
+2026-10-20T18:34:53Z | Filbert (Opus 5.5, 048f3c63) | Q175 SSO design review r2 (DESIGN.md blob 3eb718b5e131 at 1a268249e), static | changes: C1 config.json console key fails old loaders (mosaic-config.mjs:113 rejects unknown keys; key add inside phase 2 window, rollback removes it, loader test), C2 app.js signs out only on opaqueredirect so 401 never shows sign-in; notes on tests 15/7/9a, Q-B 200-HTML classification, scratch Console flags; Q-E keep iss/sub escaped and capped; verdict sent to Sage, no Gitea/queue record
+2026-10-20T18:40:20Z | Filbert (Opus 5.5, 048f3c63) | Q175 SSO design review r3 (DESIGN.md blob a152fd58e18e at 817e8f51b), static | approve on condition D1 (slot file checks stay out of shared loader, shape-only there) as a line edit; D2 notes: slot root from configDir, scratch dataRoot, name discovery GETs for Mos; C1/C2 and notes verified; Mos C1 sequence confirm still open; no Gitea/queue record
+2026-10-20T18:41:20Z | Filbert (Opus 5.5, 048f3c63) | Q175 SSO design D1/D2 check (DESIGN.md blob eba861f5d2bb at d55d86bb0), static git diff 817e8f51b..d55d86bb0 | ack: D1 and D2 match; design approved; Mos C1 sequence confirm still open; no Gitea/queue record
+2026-10-20T18:57:10Z | Filbert (Opus 5.5, 048f3c63) | row 190 design review r2 (#1688, DESIGN.md sha256 5493c9df3ec0) | CHANGES to Darkwing, cc Sage: B1 claim check on MOSAIC_CONFIG-only selection, B2 shared prefix drop-in dirs; N1-N7 notes; static read, no slot, no Gitea or queue record
+2026-10-20T19:00:04Z | Filbert (Opus 5.5, 048f3c63) | row 190 design review r3 (#1688, DESIGN.md sha256 98236a1aff98) | APPROVE to Darkwing, cc Sage: B1 and B2 closed with M13 and M14, N7 settled by Sage's 48ebee0ff; static read, no slot; manifest round gets a queue review record (sage-1337)
@@ -368,7 +368,7 @@ reports checkout or copy identity and refactor drift, and writes nothing.
 ```
 scripts/stack-release.sh adopt BUSINESS
 scripts/stack-release.sh activate ID BUSINESS [--pm | --pm-after-harness] [--migrate] [--tester-port N]
-    [--proof-header NAME --proof-file PATH | --no-proof] [--timeout S] [--plan]
+    [--proof-header NAME --proof-file PATH | --no-proof | --sso] [--no-send] [--timeout S] [--plan]
 scripts/stack-release.sh pm-on BUSINESS [--timeout S]
 scripts/stack-release.sh rollback BUSINESS [--restore ACTIVATION [--events N]] [--timeout S] [--plan]
 scripts/stack-release.sh status BUSINESS
@@ -480,6 +480,44 @@ copies. It checks the file with `stat` and `realpath` and never reads the value.
 or `off`. On the live copy it also notes that the run re-pins the pointer's copy
 and only the Console flags change.

+`activate ... --no-send` (row 189, mos-0972) drops `--send` from the pointer's
+Console flags and the unit, so the Console serves reads and no human sends. It
+may name the live copy while the pointer holds `--send`; once `--send` is gone a
+same-copy `--no-send` refuses `already-active`. Later activates, `pm-on` and
+rollbacks carry the pointer, so send stays off. No flag puts `--send` back.
+`--plan` prints one `send:` line: `dropped`, `off` with or without the
+`--no-send` note, or `carried`.
+
+`activate ... --sso` (row 200, #1698) starts the Console with Q175 sign-in
+(row 192). It drops `--public-host`, `--auth-header`, `--allow-user` and any
+proof pair from the pointer's Console flags and the unit, and puts `--sso` after
+the other flags, before `--send` and `--tester-port`. It may name the live copy
+once, so a copy already at row 192 or later turns sign-in on without a copy
+change. Later activates, `pm-on` and rollbacks to a copy with `--sso` carry it.
+`--sso` with a proof pair or `--no-proof`, or on any other verb, is a usage
+error. Before anything stops, a run whose Console flags hold `--sso` refuses
+`sso-target` for a target Console without it, `sso-config` when the target's own
+`checkConsole` refuses the config's `console` key (or there is none, in which
+case, from another copy, it names the first step: activate the target without
+`--sso`, then write `console.sso`), and `sso-slot` for each provider's slot file
+that is missing, a symlink, not a regular file, not owned by this uid, has group
+or other bits, resolves inside the repository or the copies, or is empty. It
+uses `lstat`, `stat` and `realpath` on the slot and never reads it. `--plan`
+prints one `sso:` line: `on` with what it drops and carries, `carried`, or
+`dropped` on a rollback.
+
+A rollback from an `--sso` pointer to a copy whose Console lacks `--sso` takes
+the Console flags from the rollback set of the activation that moved the stack
+onto the pointer's copy from the target, past any same-copy re-pin, checked
+against the set's `SHA256SUMS`. `--send` and `--tester-port` follow the pointer.
+When that set is missing, fails its sums, holds no readable argv or already ran
+`--sso`, the run refuses `sso-rollback-flags`. Any activate or rollback also
+refuses `config-console-key` before anything stops when the config holds a
+`console` key the target's `scripts/mosaic-config.mjs validate` refuses (a copy
+before row 192 refuses the key). The message says to remove the key first. So a
+window re-pins to row 192 or later before it writes the key, and a rollback past
+row 192 removes the key first.
+
 #### A target past c216f47db: the PM after the harness kind

 From c216f47db on, the bus launches the PM only with a `harness` kind in the
@@ -0,0 +1,73 @@
+# Brief: activate --no-send drops the Console's --send
+
+Sage, 2026-10-20, for Mos's ruling mos-0972 (Q175 interim, Vikunja #412). Owner Sage, reviewer Dewey, gate owner
+Sage. Base: refactor 9ae8c73ac (row 163 landed). Line numbers are at that commit. The candidate corrects them;
+the first draft took them before row 163.
+
+This row builds the tool only. The live restart without `--send` is a separate step afterwards, a same-copy
+activate under Q173 with a backup first and a STATE report after. No test here touches `~/.mosaic-dev`, the
+live units or a slot file. Every test uses the stand-in `systemctl`, units, stores and data root that
+`packages/cli/tests/stack-release.test.mjs` already builds.
+
+## Why
+
+Mos ruled that the Console runs without `--send` until Q175 phase 2, because with `--send` live any same-uid
+process can forge `X-authentik-username` on 127.0.0.1:7332 and send as Jason (design section 8). On the pinned
+stack, the Console flags live in the pointer (`~/.mosaic-dev/state/stack-active.json`):
+
+- `console_for_target` (scripts/stack-release.sh:664-693) carries the pointer's flags unchanged. Only
+  `--tester-port` and the row 187 proof pair can change.
+- `check_target` (:249-256) lets an activate name the pointer's copy only for a proof-pair change.
+- `adopt` refuses once a pointer exists (:828).
+- A hand `webui-service.sh install` without `--send` makes `flags_drift` (:646-657) refuse
+  `unit-flags-drift` on every later activate, pm-on and rollback.
+
+So the tool can't drop `--send` today. This row adds that one path.
+
+## The change
+
+1. `activate ID BUSINESS --no-send` drops `--send` from `RUN_CONSOLE`, so `install_stack` leaves it out of the
+   Console unit and `write_pointer` leaves it out of the pointer. Only `activate` takes it. It combines with
+   `--tester-port`, the proof pair and `--no-proof`.
+2. An activate with `--no-send` may name the pointer's copy when the pointer's Console flags hold `--send`. It
+   re-pins the live copy with only the Console flags changed, as row 187 does for the pair, including the
+   live-copy plan note and the backup of the stopped store. Without `--send` in the pointer, a same-copy
+   `--no-send` still refuses `already-active`.
+3. The steps log records `drop --send; --no-send was given`, or `--no-send was given and the pointer holds no
+   --send, so there is nothing to drop`.
+4. `--plan` prints one `send:` line for an activate or rollback: `send: dropped; --no-send was given`,
+   `send: off; --no-send was given and the pointer holds no --send`, `send: carried` when the pointer's
+   `--send` goes on unchanged, or `send: off`.
+5. `rollback` and `pm-on` don't change: they carry the pointer's flags. So once `--no-send` has run, a rollback
+   to an earlier copy keeps send off. There is no flag to turn send back on. Q175 phase 2 changes the Console
+   flags in its own row.
+6. `docs/TOOLS.md` "Pinned stack update" gets `--no-send` in the usage block and one sentence.
+
+## Tests (packages/cli/tests/stack-release.test.mjs)
+
+1. Seeded preview pointer with `--send` and `--tester-port 7333`: a same-copy `activate B acme --no-send`
+   passes. The pointer and the unit ExecStart lack `--send` and keep the preview flags and
+   `--tester-port 7333` in order. Status says `unit flags: match the pointer`. The steps log has the drop
+   line. The log line has from = to = B, and the stopped store was backed up.
+2. A plain same-copy activate still refuses `already-active`. So does a same-copy `--no-send` once `--send` is
+   gone.
+3. `--plan` prints the four `send:` lines in their cases, with the live-copy note on the same-copy run.
+4. After `--no-send`, a rollback to the earlier copy and `pm-on` both leave `--send` out of the pointer and
+   the unit.
+5. `--no-send` on `rollback`, `pm-on`, `status` or `adopt` is a usage error (exit 4).
+6. `--no-send` with the proof pair, and with `--no-proof`, on a pointer holding both: each drops what it
+   names and keeps the rest.
+
+## Mutants (each must fail at least one test)
+
+- M1: the same-copy exception ignores `--no-send`.
+- M2: the same-copy exception allows `--no-send` without `--send` in the pointer.
+- M3: `--no-send` drops `--send` from the pointer but not from the unit (it writes the pointer from
+  `P_CONSOLE`).
+- M4: rollback re-adds `--send`.
+- M5: the arg parser accepts `--no-send` for rollback.
+
+## Gate
+
+Dewey approves the manifest. The cli suite and every `scripts/test-*.sh` are green on Sage's gate, and the
+mutants are killed.
@@ -0,0 +1,57 @@
+# Brief: a credential store per agent, own git identity, pushes to a remote
+
+Sage, 2026-10-20, for mos-0974 (MVP T1 item 6) and the MVP plan
+(`jason-master-restart/projects/mosaic-mvp/PLAN.md` item 6, GAP-MAP G11 and G13; TARGET.md: "credentials store
+available for all agents; secrets protected with RLS equivalent" and "Agent uses own credentials for git and
+other actions"). Gitea #1697. Owner Megavolt (Opus 5.5, a new builder seat), reviewer Duckworth, gate owner
+Sage. Base: refactor at the brief commit. Design first. The first deliverable is
+`agents/megavolt/work/queue-ROW/DESIGN.md`.
+
+This row draws a security boundary. Sage reviews the design's authority model, and Mos rules on it before any
+code is written.
+
+## What exists today (GAP-MAP, measured at 9ae8c73ac)
+
+- G11. Credential references exist per instance for Gitea and Vikunja only
+  (`packages/business/src/credentials.mjs`, `packages/bus/src/credentials.mjs`, `vocabulary.mjs:103`). One
+  Claude env file is shared by every seat.
+- G13. Agents use their own Vikunja token (`packages/tasks/src/adapter.mjs`). Git goes through the host
+  socket (`packages/cli/src/git-socket.mjs`). Gitea tokens are loaded but never used.
+- The development repository's helper (`scripts/git-credential-mosaic.mjs`, wired in `.git/config` for
+  git.mosaicstack.dev) pushes as one identity. Until this row lands, seats push only their own `<seat>/*`
+  branches through it (mos-0981).
+
+## What the design must settle
+
+1. The store. Where each agent's credentials live, per instance, under the row 190 config canon. File modes,
+   ownership and the read path. Which process may read which entry, and how the bus enforces that (the "RLS
+   equivalent"). A process asking for another agent's entry is refused and logged.
+2. Kinds. Gitea (git over HTTPS, and the API), Vikunja, and the model provider. Say which kinds 10-27 needs
+   and which wait. The model provider entry must not copy jwoltje's `claude-session.env`. If it needs a new
+   provider account or subscription, flag it for Jason and don't pick one.
+3. Git identity and push. Each agent commits with its own name and email and pushes with its own token to a
+   remote it is granted. Which refs an agent may push (its own branches, never the default branch or another
+   agent's), and where that's enforced: the Gitea side (branch protection, token scopes) and our side. How
+   this fits the host git socket, or replaces it.
+4. Lifecycle. Issue, rotate (`rotateBy`, `expires`), revoke and delete, and what row 194 (agent lifecycle) calls
+   when an agent is hired or fired. A fired agent's credentials stop working at once.
+5. Who does what. Creating a Gitea user or token, or any account outside the fleet, is Jason's (Q173
+   exclusions). The design lists each such step as a command or UI action for Jason. Agents never mint
+   accounts.
+6. Migration. Today's seats (jarvis helper, seat tokens) keep working until each moves. The mos-0981 push
+   rule ends only when Mos says so.
+7. What this row closes in G11 and G13, and what stays open.
+
+## Boundaries
+
+- No credential value is read, printed, logged or committed. Tests use fake tokens in scratch roots and a
+  fake Gitea.
+- No change to `~/.mosaic-dev`, `~/.config/mosaic-dev`, the live units, slot files, `~/.mosaic` or the live
+  `.git/config` of the canonical checkout.
+- No request to git.mosaicstack.dev, tasks.woltje.com or any provider from a test.
+
+## Gate
+
+Duckworth approves DESIGN.md, Mos rules on the authority model, then Duckworth approves the manifest. The bus,
+business, cli and tasks suites and every `scripts/test-*.sh` are green on Sage's gate, and the design's
+mutants are killed.
@@ -0,0 +1,47 @@
+# Brief: agent lifecycle from the Console and the CLI, with a per-agent hire/fire veto
+
+Sage, 2026-10-20, for mos-0974 (MVP, DECISIONS Q176, Vikunja #414 "User and main agent can create and spawn
+agents" and "User maintains ability to terminate, regenerate, or create agents via WebUI or CLI ad-hoc", #415
+Case 1 "Chief of staff agent has hire/fire authority for agents as needed; unless user forbids per agent" and
+"User maintains ability to restructure organization at will"). Gitea #1692. T1 item 5. Owner Honker, reviewer Webby (mos-0981), gate
+owner Sage. Base: refactor at the brief commit.
+
+Design first. The first deliverable is `agents/honker/work/queue-194/DESIGN.md`. Webby reviews it before any
+code.
+
+## What exists today (GAP-MAP.md G8, G9, C1.5, C1.6, measured at 9ae8c73ac)
+
+- The chief launches only listed instances (`roles/chief-of-staff.json`, harness `tools.mjs` launch,
+  `broker.mjs:1968`). No user verb launches an arbitrary agent.
+- Terminate exists (`packages/cli/src/cli.mjs:447`, `instances.mjs:9-11`, webui `serve.mjs:288, 535`). There
+  is no regenerate, no delete and no Console launch.
+- Instance changes need a bus restart (`instance-settings.mjs:35,75`, `organization.mjs:83`). Add and change
+  only, no delete.
+- Human-only membership acts as a veto today, but there is no per-agent veto list.
+
+## What the design must settle
+
+1. The verbs: create (from a role and a name), launch, terminate, regenerate (a fresh session with the same
+   identity and role), and delete (with what happens to its sessions, workspace and run evidence, which
+   stays write-once). Each one is a human verb on the CLI and a Console action.
+2. Chief hire/fire. What the chief may do on its own, and the per-agent veto: the human marks an agent so
+   the chief can't fire or replace it, and marks roles the chief can't hire. Where the veto lives and how
+   the broker enforces it.
+3. Live changes. Which changes take effect without a bus restart, and how a running bus picks them up
+   safely.
+4. RBAC. Human roles come from row 193 (Morgana). Until it lands, these verbs are owner-only. The design
+   states the hook that row 193 fills.
+5. Per instance. Row 190 runs one instance per OS user. Lifecycle verbs act on their own instance only.
+6. The kill switch (row 191, Rocko) refuses every launch path. These new launch paths check it too.
+
+## Boundaries
+
+- No test touches `~/.mosaic-dev`, `~/.config/mosaic-dev`, the live units or a slot file.
+- Role authority is declared in `roles/` and changes only by reviewed commits (AGENTS.md invariant 7). This
+  row adds verbs, not new role authority. Any role file change is called out for review.
+- The build may chain on rows 190, 191 and 193 candidates (Q177).
+
+## Gate
+
+Webby approves DESIGN.md, then the manifest. The bus, cli, business and webui suites and every
+`scripts/test-*.sh` are green on Sage's gate, and the design's mutants are killed.
@@ -0,0 +1,77 @@
+# Brief: Melanie's hub instance on its own host (row 195, was 190b)
+
+Sage, 2026-10-20. Rewritten for Mos's rulings mos-0998 and mos-1005 (Vikunja #418, #419). The first version
+put the hub under its own Linux user on dragon-lin. That form can't pass Duckworth's B7 there, because the
+factory uid's `sudo -n` succeeds on dragon-lin (Mos's recon, brain-redux
+`projects/mosaic-mvp/MELANIE-HOST-RECON.md`). Melanie's own server is ruled out too: it has 1.2 GiB RAM free
+with her two Hermes bots running, and co-tenancy would share her user and her passwordless sudo. The hub runs
+on a separate host. Which host is Jason's decision (#419): hardware outside the cluster, a cluster VM with
+factory PVE root removed, or a cluster VM with that residual accepted. This row is written so the host choice
+doesn't change it. Gitea #1693. On the 10-27 MVP path. Federation R8 (Gizmoduck's design r4, 04a6112be) needs
+this row or nothing.
+
+Owner Darkwing (Opus 5.5), reviewer Duckworth (author of B5 and B7), gate owner Sage. Chained on row 190
+(Q177): the hub runs under row 190's config canon. Design first. The first deliverable is
+`agents/darkwing/work/queue-190b/DESIGN.md`.
+
+## Goal
+
+Melanie's hub instance (Case 2, C2-13) runs on its own host. No factory agent can read or write the hub's
+config, data root or secrets, reach its bus socket, or log in to the hub host. Her writing reaches the hub only
+through the existing git.mosaicstack.dev remotes, books repo only.
+
+## Provision (blank until Jason answers #419)
+
+Who provisions the host and how is left open. Sizing from Mos (mos-0998): 4 vCPU, 8 GB RAM, 64 GB disk,
+internal network only. Each agent process measures 300 to 390 MB RSS on dragon-lin. The design takes the host
+as given: a fresh Linux host with a named admin path, reachable by the deploying seat while the row runs.
+
+## The design must state
+
+1. The deploy. Exactly what Darkwing installs on the hub host and how: the stack copy, node, the units, the
+   config dir and data root under row 190's canon (O1: `~/.config/mosaic-NAME`, and "`~` is the home of the OS
+   user that runs the instance"). Which commands run as which user on the hub host, and which need its root.
+2. Re-pin, rollback and backup on the hub host, and who runs them after the deploy key is gone.
+3. How the hub gets model access without a copy of jwoltje's `claude-session.env` or any factory credential.
+   If that needs the credentials row (T1 item 6), say so and name the interim. If it needs a new subscription
+   or a new provider account, flag it for Jason and don't pick one (mos-1008).
+4. The books repo path. Which git.mosaicstack.dev remote, which credential the hub holds for it, and that it
+   can't read or push any other repository.
+5. The admin path and the end state. The host ends with no key the factory uid can read. The design names the
+   admin path that remains (for example the hypervisor console, or a key kept off the factory uid) and who
+   holds it.
+6. The acceptance script, as code Duckworth can read. It takes Gizmoduck's list of infrastructure gate items
+   as its input (mos-1011), not a fixed set of checks. Each item names a path, its closed form and its
+   accepted form, and the script reports which form holds for each, or fails. The list covers at least:
+   - federation R8's separate-host form: the hub's bus socket, data root and config dir don't exist on the
+     factory host, the factory host mounts nothing of the hub's, and no factory agent holds a login or key
+     for the hub host
+   - B7: from the factory uid, `sudo -n`, `doas -n`, `su`, polkit, and `ssh -o BatchMode=yes` to the hub
+     host all fail
+   - the hypervisor and backup paths ops-01 measured (mos-1011: one PVE node the factory key has root on,
+     PBS on that node with unencrypted backups, a flat /16 LAN), each closed or accepted by Jason
+7. The identity provider and TLS front end (B8, mos-1008, mos-1011). Either the factory holds no credential
+   that can create users, change groups, issue tokens or impersonate in the issuer the hub trusts, or the hub
+   uses an issuer the factory can't administer. A brand, tenant or app inside the same Authentik does not
+   count as separate. The same holds for the TLS front end that serves the hub. The proof is a failed admin
+   call from every token the factory's root can read. No credential value is printed in that proof.
+
+## Boundaries
+
+- Provisioning, hypervisor access and any infra or k3s change are Jason's (Q173 exclusions). Mos takes the
+  hypervisor residual (factory root on the PVE nodes, Q172) to Jason. It doesn't block this row.
+- Melanie's server (`[email protected]`) is reference only, read only, under Jason's authorization in
+  mos-0995. Nothing on it changes, and her Hermes bots keep running.
+- No tunnel, Traefik or other exposure outside the internal network. That waits for Jason, after Q175 SSO.
+- No credential value is printed, logged or committed. Keys made for the deploy are removed at the end, and
+  the acceptance script proves it.
+- The admin-call proof in point 7 and any call to the issuer or the TLS front end run only in a window Mos
+  approves, never as a test or an anonymous probe (Q175).
+- Tests in the repository use scratch roots and stand-ins. The live deploy and the acceptance run on the hub
+  host are a window with a backup first (where there is state) and a STATE report after.
+
+## Gate
+
+Duckworth approves DESIGN.md, then the manifest. Any repository change is green on Sage's gate (cli suite and
+every `scripts/test-*.sh`), with the design's mutants killed. The row is done when the acceptance script passes
+on the hub host from the factory uid, Duckworth reads its output, and Mos confirms.
@@ -0,0 +1,62 @@
+# Brief: the human boundary across uids and humans (P19 333)
+
+Sage, 2026-10-20, for Mos's order mos-0989 (P19 333, MOSAICSTA-173, is now on the 10-27 path: federation R3 and
+row 193 need it). Gitea #1694. Owner Gander (Codex gpt-6.1-sol, a new builder seat under mos-0977 item 5),
+reviewer Duckworth, gate owner Sage. Latest-by: DESIGN.md approved by 2026-10-22, landed by 2026-10-24, and in
+any case before federation R3 lands. R3 and row 193 may chain on this row's candidate (Q177). Base: refactor at
+the brief commit. Design first. The first deliverable is `agents/gander/work/queue-ROW/DESIGN.md`.
+
+## The problem, as filed and as it now matters
+
+P19 333 as filed (row 87, mos-0657): the Console listens on a loopback TCP port, and any host process that
+reaches it, under any uid, acts as Jason. Jason accepted that as a documented limit for a one-user host
+(mos-0787, row 161). Two things change that:
+
+- Row 190b (#1693, mos-0986) puts Melanie's hub under its own Linux user. Factory processes then sit on another
+  uid, on the same host, next to the hub's ports and socket. The other-uid reach is now the Case 2 threat.
+- Federation r2 (gizmoduck-0004, 60b9b112a) binds a bus user only from a user-cli whose proof passes the human
+  walk, whose direct parent is the bus's own Console, and which holds a live grant. That rule rests on the
+  path-bound human proof (#225): today a same-uid process that runs the tree's `human-cli.mjs` acts as the
+  human, without touching the Console. The Q175 design (section 8) names that limit and leaves it here.
+
+## What already settles part of it
+
+- Q175 phase 2 (#412) settles the Console-ingress part on the main port. Under `--sso`, 7332 answers any
+  non-public Host with 403 except `GET /healthz`, and every other request needs a verified OIDC session. A
+  process on another uid that reaches the port gets only `/healthz`. Phase 1 (row 192) builds it; it is live
+  only after the phase 2 window.
+- Row 189 (`--no-send`) is interim only. Until phase 2 the Console takes no human writes, so the reach is
+  read-only. It settles nothing.
+- Row 190b separates files and units by uid. Whether the hub's `broker.sock` refuses the factory uid depends on
+  its directory and socket modes, which this row checks and tests rather than assumes.
+
+## What the design must settle
+
+1. Inventory every listener and entry point per instance: the Console port, the tester listener (7333 today),
+   `broker.sock`, the human CLI wrapper, the Discord connector and anything row 190 adds. For each: who can
+   reach it today from the same uid and from another uid, with and without `--sso`.
+2. The tester listener. It serves reads and the row 175 tester writes to anything that reaches it, on any uid.
+   Close the other-uid reach (for example a unix socket with 0600 modes, or a peer-uid check on loopback), or
+   bring Mos a concrete reason it must stay open. bus.tester stays Jason's switch.
+3. The bus human boundary. How the bus tells the human's own verified call from a same-uid process that runs
+   `human-cli.mjs`. State what federation R3's direct-parent rule needs from the bus (peer credentials on
+   `broker.sock`, the parent check, how it can't be forged by a child of an agent), and what stays possible for
+   a same-uid process after this row. Say it plainly where a residual limit remains.
+4. Fit with row 193 (Morgana, human users and roles; Mos's B1 rule: a principal comes only from something the
+   bus verifies) and with federation R3. One mechanism, not three.
+5. Migration: the live single-user Console and bus keep working until each instance re-pins.
+6. Which parts of P19 333 this row closes, which parts Q175 phase 2 closes, and what P19 333 says when it is
+   closed.
+
+## Boundaries
+
+- Who can reach the Console from outside stays Jason's. This row changes what a host process can do once it
+  reaches a local port or socket.
+- No test touches `~/.mosaic-dev`, `~/.config/mosaic-dev`, the live units or a slot file. No test creates a real
+  second uid; use stand-ins as rows 190 and 190b do, and name any part only a Q173 window can prove.
+- No request to the live 127.0.0.1:7332 or 7333, mosaic.woltje.com or auth.diversecanvas.com.
+
+## Gate
+
+Duckworth approves DESIGN.md, then the manifest. The bus, webui and cli suites and every `scripts/test-*.sh`
+are green on Sage's gate, and the design's mutants are killed.
@@ -0,0 +1,56 @@
+# Brief: many humans per business, human roles, private and shared threads
+
+Sage, 2026-10-20, for mos-0974 and mos-0977 (MVP, DECISIONS Q176, Vikunja #414 "RBAC enforcement" and #415
+Case 1 "Additional users can be configured for access" and "Shared and private agent sessions available per
+user; RBAC"). Gitea #1691. T1 item 3. Owner Morgana, reviewer Duckworth, gate owner Sage. Base: refactor at the brief
+commit.
+
+Design first. The first deliverable is `agents/morgana/work/queue-193/DESIGN.md`. Duckworth reviews it before
+any code.
+
+## What exists today (GAP-MAP.md, measured at 9ae8c73ac)
+
+- One human per business: `packages/business/src/business.mjs:160`, and the broker's human check
+  (`packages/bus/src/broker.mjs:532-538`).
+- Threads have an owner field only (`packages/bus/schema.sql:247`, `broker.mjs:353-360`). Nothing is private
+  or shared.
+- RBAC covers agents only (`role.mjs`, `vocabulary.mjs`, `broker.mjs:769-799`, harness `gate.mjs`). Humans
+  have no roles.
+- The human proof is path-bound (#225, P19 333): any same-uid process that runs the tree's `human-cli.mjs` acts
+  as the human. That limit is real and the design must say how several humans change it.
+
+## What the design must settle
+
+1. The human model. How a business lists several humans, how each is identified, and how a Console SSO
+   session (#412, row 192: each session names a provider subject mapped to a name) and a CLI call each
+   become exactly one of them. Starting rule (Mos, mos-0985, from Duckworth's federation review B1 at
+   b402197ff on origin duckworth/reviews): the bus takes a human principal only from something it verifies,
+   such as the Console's OIDC session under #412. A process's own claim of who it is never counts.
+2. Human roles. A small fixed set to start (for example owner, member, viewer), what each may do on the
+   bus and in the Console, and who may add or remove humans and change roles. Restructuring stays with
+   the owner (Case 1).
+3. Threads. Private threads (visible to their owner and the agents in them) and shared threads (visible to
+   named humans or all members). Schema change, migration of existing rows (all become the current human's),
+   and every read path that must filter.
+4. One user and grant store. Gizmoduck's federation design (thread 9312a896, design 6925f78f0 on
+   gizmoduck/federation-design) proposes `access.json` for grants. Mos's reading (mos-0977): one model for
+   local and federated humans, because two stores drift. Lead decision (Sage, 2026-10-20, to gizmoduck-0002):
+   row 193 takes Gizmoduck's human-authored `<configDir>/access.json` (federation DESIGN.md section 3.5) as
+   the one user and grant store, and extends it with local humans, roles and shared threads. Federation adds
+   only a `home` field. The design confirms this or brings a concrete reason against it to Sage and
+   Gizmoduck before the build. Federation's R1 (the access.json loader) then comes before this row's build.
+5. The bus human boundary. With several humans, the human verbs must know which human calls. State what a
+   same-uid process can still do (P19 333) and whether row 190's one-instance-per-OS-user direction narrows
+   it.
+6. Migration and rollback. Existing businesses keep working with their one human as owner.
+
+## Boundaries
+
+- Changing who can reach the Console from outside is Jason's. This row changes who is allowed once inside.
+- No test touches `~/.mosaic-dev`, `~/.config/mosaic-dev`, the live units or a slot file.
+- The build may chain on rows 190 and 192 candidates (Q177). Each row keeps its own review and gate.
+
+## Gate
+
+Duckworth approves DESIGN.md, then the manifest. The bus, business, cli and webui suites and every
+`scripts/test-*.sh` are green on Sage's gate, and the design's mutants are killed.
@@ -0,0 +1,65 @@
+# Brief: one kill switch for the bus, every run, Discord and new launches
+
+Sage, 2026-10-20, for Mos's order mos-0974 (MVP, DECISIONS Q176, Vikunja #414 "Kill switch is available to
+stop all processing immediately"). Gitea #1689. T1 item 4. Owner Rocko, reviewer Dewey, gate owner Sage. Base: refactor
+at the brief commit.
+
+Design first. The first deliverable is `agents/rocko/work/queue-191/DESIGN.md`, which Dewey reviews before
+any code. Then the build follows the design, with tests and mutants.
+
+## The goal
+
+One human command and one Console button stop all processing at once and keep it stopped until the human
+clears it:
+
+- The bus takes no new work. Agent verbs that start or continue work refuse with a fixed code while the
+  switch is on. Reads and the human's own verbs, including the clear, still work.
+- Every running managed session and task run is stopped (SIGTERM, then SIGKILL after a bounded wait), and
+  each stop is recorded as an event.
+- Discord stops (its existing STOP file and `stop` verb) and can't restart while the switch is on.
+- New launches refuse: the launcher, chief hire, `run-task.sh`, and any other path that starts an agent.
+- The switch survives a bus restart and a host reboot (it lives in the data root, not in memory).
+- Turning it on and clearing it are human-only verbs, through the bus human proof, and each leaves one
+  event with who and when.
+
+## What exists today (GAP-MAP.md G10, measured at 9ae8c73ac)
+
+These are pieces, with no single switch over them. The design inventories every path that starts or
+continues work and says how each one checks the switch:
+
+- `launch.revoke` and `launch.restore` in `packages/bus/src/broker.mjs` (around :2087), human-only.
+- The `mosaic launches off|on` verbs in `packages/cli/src/cli.mjs` (around :456-533) and
+  `packages/cli/src/launcher.mjs` (around :769).
+- The Discord STOP file (`packages/discord/src/cli.mjs:18-27`).
+
+## What the design must settle
+
+1. Where the switch state lives, its format, and how each process reads it (the broker checks on every
+   work verb; the launcher and Discord check before start). The race: a launch already past its check when
+   the switch goes on must still be stopped.
+2. The CLI verb names (for example `mosaic halt` and `mosaic resume`) and the Console button. The button
+   is a human write, so it goes through the same writer and same-origin checks as other Console writes, and
+   it works under the Q175 SSO session (#412) once phase 2 lands. Until then, test it with fixture servers
+   only.
+3. Per instance. Row 190 adds several instances per host. The switch is per instance, so it stops one
+   instance and never another. The design names how it finds the instance's data root. This row may build
+   on the row 190 candidate (Q177 merge-chaining).
+4. What a stopped run's record says, so run evidence stays write-once and honest.
+
+## Tests
+
+Each part of the goal gets a test: work verbs refuse, a running stand-in session and run are stopped,
+Discord refuses to start, every launch path refuses, the switch survives a restart, an agent can't set or
+clear it, and the clear lets work resume. Mutants: drop the check from one launch path, let an agent clear
+the switch, keep the switch in memory only, skip the SIGKILL after the wait. Each one must fail a test.
+
+## Boundaries
+
+- No test touches `~/.mosaic-dev`, the live units, a real Discord bot or a slot file. Use the stand-in
+  units, scratch data roots and fixture servers the suites already build.
+- Rocko has no git credentials. Sage commits the candidate and runs the queue moves Rocko can't.
+
+## Gate
+
+Dewey approves DESIGN.md, then the manifest. The cli suite, the bus, discord and webui package suites and
+every `scripts/test-*.sh` are green on Sage's gate, and the mutants are killed.
@@ -0,0 +1,70 @@
+# Brief: several Mosaic Stack instances on one host
+
+Sage, 2026-10-20, for Mos's order mos-0974 (MVP, DECISIONS Q176-Q178, Vikunja #414). Gitea #1688. T1 item 1. Owner
+Darkwing, reviewer Filbert, gate owner Sage. Base: refactor at the brief commit. This row blocks both MVP
+cases: Case 1 (Jason's software factory) and Case 2 (Melanie's creative writing hub) run as two instances
+on one homelab host, beside the current mosaic-stack test instance.
+
+Design first. The first deliverable is `agents/darkwing/work/queue-190/DESIGN.md`. Filbert reviews it
+before any code, as Q175 did. Then the build follows the design, with tests and mutants.
+
+## The goal
+
+Two or more instances run side by side on dragon-lin. Each one has its own config file, data root (store,
+broker.sock, host.lock, state, runs, sessions, workspaces), businesses, bus unit, Console unit and port,
+tester port, Discord unit, Claude session env file, stack-active pointer and activation log. No instance's
+commands, units or tools address another instance's state by default or by mistake. On one uid this is
+addressing only, not a security boundary: a same-uid process can still read another instance's files.
+Isolation against that is row 190b (#1693, mos-0986), one Linux user per instance. The current instance keeps working unchanged: its
+config path, data root, unit names and ports stay as they are, and no re-pin is needed for it.
+
+## Known single-instance points (GAP-MAP.md, measured at 9ae8c73ac)
+
+The design starts with a full inventory. Grep every script and package, not only these:
+
+- `packages/cli/systemd/mosaic-bus.service.in`: `mosaic-bus@<business>` sets no `MOSAIC_CONFIG` and reads the
+  fixed `EnvironmentFile=-%h/.config/mosaic-dev/secrets/claude-session.env`.
+- `packages/webui/systemd/mosaic-webui.service.in` and `scripts/webui-service.sh`: one `mosaic-webui.service`.
+- `packages/discord/systemd/[email protected]` and `scripts/discord-service.sh`.
+- `scripts/stack-copy.sh:8` hardcodes `BUSINESS=mosaic-stack`, and `:95` reads `mosaic-webui.service`.
+- `scripts/stack-release.sh`: unit names, the Console port and the tester port default, `COPIES` (:28), the
+  pointer under `$DATA/state` (:1474), and `rehearse`.
+- `scripts/mosaic-config.mjs`, `scripts/bootstrap.sh`, `scripts/reset.sh`, `scripts/land-work.sh`,
+  `packages/webui/src/cli.mjs`, `packages/business/src/{business,vars}.mjs`, and
+  `packages/conversation/src/guard.mjs` each name the default config path or data root.
+
+## What the design must settle
+
+1. Instance identity. How a name maps to its config file and how every tool picks the instance (an
+   `--instance NAME` flag, `MOSAIC_CONFIG`, or both), and what happens with neither (the current default,
+   unchanged). Name rules, and refusal of a name that collides.
+2. Config canon. AGENTS.md invariant 2 says `~/.config/mosaic-dev/config.json` is the sole system config,
+   created only by `scripts/bootstrap.sh`. Several instances mean several config files. The design proposes
+   the exact wording change and how bootstrap creates an instance config without overwriting one. Mos rules
+   on the canon change before the build.
+3. Unit names and templates. The bus, Console and Discord units per instance, how `MOSAIC_CONFIG` and the
+   Claude env file reach each unit, and how the current unit names stay valid for the default instance.
+4. Ports. Each instance's Console and tester ports, with a refusal when two instances claim the same port.
+5. Stack copies and the pointer. Whether copies are shared between instances (read-only trees, so sharing
+   may be fine) and how the pointer, activation log, backups and `flags_drift` stay per instance.
+   `stack-release.sh` and `stack-copy.sh` take the instance.
+6. Secrets. The per-instance Claude session env file and the secrets slot root, resolved from the instance's
+   config dir (the Q175 design resolves its slot the same way: `<configDir>/secrets/mosaic-stack/<slot>`).
+7. Isolation proof. What the tests show: two instances started side by side on stand-in units and scratch
+   roots, each reads only its own config and data root, a command aimed at one never touches the other, and
+   the default instance's paths and unit names are byte-identical to today.
+
+## Boundaries
+
+- No test touches `~/.mosaic-dev`, `~/.config/mosaic-dev`, the live units or a slot file. Use the stand-in
+  systemctl, units and scratch roots that `packages/cli/tests/stack-release.test.mjs` already builds.
+- Standing up a real second instance on dragon-lin is a later window under Q173, with a backup first and a
+  STATE report after. Exposing a new Console through the tunnel or Traefik changes who can reach it from
+  outside, so it waits for Jason. SSO (Q175, #412) comes first for any instance a second user can reach.
+- Merge-chaining (Q177): rows that need instances (human users, kill switch, lifecycle) may build on this
+  row's candidate. This row keeps its own review and gate.
+
+## Gate
+
+Filbert approves DESIGN.md, then the manifest. The cli suite and every `scripts/test-*.sh` are green on
+Sage's gate, and the design's mutants are killed.
@@ -0,0 +1,57 @@
+# Brief: retire the control board writer on 7331
+
+Sage, 2026-10-20, for Mos's ruling mos-1008 item 2. Gitea #1696. MVP 10-27 work. Owner Bushroot (Haiku 5.5, a
+low-level model under Q177), reviewer Webby, gate owner Sage. Base: refactor at the brief commit.
+
+## Why
+
+`packages/control-board/src/serve.mjs` is a loopback HTTP service on 7331 with no authentication. It reads
+transcripts and writes through `/api/reply`. Any host process that reaches the port can do both. That fails
+Q175 ("zero trust with verification"). Gander found it in the row 196 inventory (gander-0004). Nothing listens
+on 7331 now (`ss -ltnp`, 2026-10-20T19:05:09Z), so retiring it costs the least.
+
+## Steps, in order
+
+1. Inventory first. List every reference to the control board and to 7331: scripts, units, `scripts/mosaic`
+   and other CLI dispatch, docs (AGENTS.md, READMEs, TOOLS.md), package.json scripts, tests, and the Console
+   (`packages/webui`). For each, say whether it starts the writer, reads its code, or only mentions it.
+   Commit the list as `agents/bushroot/work/queue-ROW/INVENTORY.md` and send it to Sage and Webby.
+2. Stop if something depends on it. If a reference shows a live dependency (the Console or another package
+   imports code that only the control board has, or a unit or script still starts it), stop. Sage takes it to
+   Mos before anything is removed.
+3. Otherwise retire the writer. Either remove the `serve` entry point, or make it refuse to start with a
+   message that points to the Console. Keep any read-only code another package imports, and say which.
+   Update the docs that tell people to start it. The AGENTS.md text about the control-board reply convention
+   is a separate matter. Change it only if it tells someone to start 7331.
+
+## Mos's call on the Console dependency (mos-1019)
+
+The inventory (004f133bd) found that the Console proxies `/api/board`, `/api/seen`, `/api/reply` and the
+conversation routes to `DEFAULT_BOARD` on 7331 (`packages/webui/src/serve.mjs:12`), so the board view returns
+502 today. Mos took Sage's recommendation: retire the 7331 listener and its README start commands, and have
+the Console call the board's read code in-process, behind the Console's own auth (Q175 SSO on 7332).
+`/api/reply` stays only under `--send`. The DESIGN.md for that change comes before code, and Webby approves
+it.
+
+## Acceptance
+
+Nothing in the stack can start a writer on 7331. A test proves it: the entry point refuses (or is gone), no
+script or unit starts it, and a grep check finds no starter. Each change gets a mutant that brings the writer
+back and the test kills it. Mos added three items (mos-1019):
+
+- The board view answers from the Console with nothing listening on 7331.
+- Every board route sits behind the Console's auth.
+- A test proves `/api/reply` refuses without `--send`.
+
+Test fixtures that bind port 0 may stay if they only test the code in-process.
+
+## Boundaries
+
+- No change to the live units, `~/.mosaic-dev`, `~/.config/mosaic-dev`, slot files or `~/.mosaic`.
+- No request to any live port.
+- Single test files run freely. Suites need Sage's slot.
+
+## Gate
+
+Webby approves INVENTORY.md, then DESIGN.md, then the manifest. The control-board and webui package suites, the cli suite and
+every `scripts/test-*.sh` are green on Sage's gate, and the mutants are killed.
@@ -0,0 +1,42 @@
+# Brief: a second gate lane, two full gates at once on dragon-lin
+
+Sage, 2026-10-20, for Mos's order mos-0977 item 6 ("put the design for a second gate lane on the list now")
+and the MVP push (mos-0974). Gitea #1695. Owner Herb (Codex gpt-6.1-sol, a new builder seat), reviewer
+Webby, gate owner Sage. Base: refactor at the brief commit. Design first. The first deliverable is
+`agents/herb/work/queue-ROW/DESIGN.md`.
+
+## Why
+
+Every full run shares one slot today. A full gate (cli suite plus every `scripts/test-*.sh`) takes about 13
+minutes or more, reviewers' runs and mutants take the same slot, and with eight or more seats building for
+10-27 the slot is the bottleneck. The slot exists because concurrent runs broke each other. The busy check is
+`agents/sage/work/gate-lane/busy-now.sh` (a copy of Sage's), and the gate is
+`agents/sage/work/gate-lane/gate-template.sh` (a copy of Sage's template). The host has 16 cores and 62 GB.
+
+## What the design must settle
+
+1. Every shared resource two concurrent runs can collide on, found from the code and tests, not guessed:
+   Docker compose project names and networks (`scripts/test-task.sh` and others), fixed TCP ports in tests,
+   unix socket paths and their 107-byte limit under TMPDIR, the sandbox's private `/tmp`, shared caches,
+   scratch and worktree paths, the queue lock, and any test that reads host-wide state (process lists,
+   `pgrep`, `/proc`). For each: how a lane gets its own copy, or why it is safe to share.
+2. Timing. Which tests have time limits that a doubled CPU load could break, measured, and what changes (a
+   bound, or a lane rule that keeps those suites apart).
+3. The lane mechanism: lane ids, a lock per lane that a run takes and releases even on a crash, the busy
+   check that reports per lane, and how a seat asks for a lane. Sage still grants it.
+4. The gate template takes a lane id and isolates everything from point 1 by it.
+5. Proof: two full gates on different candidates at once, three times, with zero cross-failures, plus the
+   wall time of each against a single-lane run. Any flake found is named with its cause.
+
+## Boundaries
+
+- No change to the live units, `~/.mosaic-dev`, `~/.config/mosaic-dev` or slot files. The proof runs use
+  scratch roots only, and it needs Sage's grant of the whole slot while it runs.
+- Test code changes that only isolate a resource are in scope. A change to what a test checks is not, and
+  goes to its owner.
+- Docker networks and containers a run makes are removed by the run (trap), and nothing else is touched.
+
+## Gate
+
+Webby approves DESIGN.md, then the manifest. The cli suite and every `scripts/test-*.sh` are green on Sage's
+gate, both singly and in the two-lane proof.
@@ -0,0 +1,47 @@
+# Brief: Q175 phase 1, the Console verifies SSO itself (--sso)
+
+Sage, 2026-10-20, for Q175 (Jason's ruling), mos-0971/0973/0977 and Vikunja #412. Gitea #1690. MVP T1 item 2. Owner
+Launchpad, reviewer Webby (mos-0981), gate owner Sage. Base: refactor at the brief commit.
+
+The design is approved: `agents/sage/work/q175-sso/DESIGN.md` at d55d86bb0 (blob eba861f5d2bb), Filbert r3
+approve plus the D1/D2 ack, Mos C1 confirmation in mos-0977, whose straggler-check condition is in the phase 2 window at b416d2ede. Build phase 1 exactly as the design says. If
+the code shows the design is wrong somewhere, stop and tell Sage, Webby and Filbert before building around it.
+
+## Scope (phase 1 only, design section 5 item 1)
+
+- oauth4webapi 3.8.8, pinned exactly (design section 2). No other new dependency.
+- The OIDC relying party in the Console: `/auth/login`, `/auth/callback`, `/auth/logout`, `/auth/signed-out`,
+  the callback steps 1-7, our own checks on top of the library, and sessions, cookies and Host rules
+  (design sections 1 and 3).
+- The shared loader, `scripts/mosaic-config.mjs`, accepts an optional `console` key and checks only its
+  shape. The slot file checks and the read run in the Console's `--sso` start, and the slot resolves from
+  the config dir (section 4, D1, D2).
+- The degraded start for an unreachable provider, and the unreachable/refused classes (Q-B, section 4).
+- `--sso` for `cli.mjs serve` and `webui-service.sh`, with its refusals against the old flags.
+- The tester listener rules (section 6).
+- The page: both fetch paths in `packages/webui/src/public/app.js` (:111 and :305) treat a 401
+  `sign-in required` as signed out, and the notice links to `/auth/login?return=<path>` (C2).
+- Logging as the design says, including the Q-E `subject-unknown` line.
+
+Out of scope: the phase 2 window, the live config.json key, phase 3 removals, the proxy-forwarded token
+(section 7), and any change to the live Console.
+
+## Tests and mutants
+
+Design section 9: tests 1-25, the positive paths, and every listed mutant, each killed by its named test.
+All tests run against the fake OP in `packages/webui/tests/helpers/fake-oidc.mjs`. No test reaches a real
+provider or Authentik, and no test touches `~/.mosaic-dev`, `~/.config/mosaic-dev`, the live units or a
+slot file. Test 25 goes in `scripts/test-config.sh`.
+
+## Boundaries
+
+- No request of any kind to auth.diversecanvas.com, mosaic.woltje.com or the live 127.0.0.1:7332 (mos-0971,
+  design section 8).
+- No credential value is read, printed or logged.
+- `npm install` runs only inside the worktree that has its own package.json, never in a directory that would
+  walk up to home.
+
+## Gate
+
+Webby approves the manifest. Filbert approved the design and answers design questions. The webui and cli suites, `scripts/test-config.sh` and every
+`scripts/test-*.sh` are green on Sage's gate, and the design's mutants are killed.
@@ -0,0 +1,39 @@
+# Brief: stack-release.sh activates a Console with --sso (Q175 phase 2 prerequisite)
+
+Sage, 2026-10-20, for Launchpad's finding F3 on row 192 (launchpad-0001) and Q175 (#412). Gitea #1698. Owner
+Launchpad, reviewer Webby, gate owner Sage. Chained on row 192's candidate (Q177): it lands after row 192 and
+before the phase 2 window. Base: row 192's candidate.
+
+## Why
+
+The phase 2 window re-pins the Console to the phase 1 commit with `--sso --send --tester-port 7333`
+(`agents/sage/work/q175-sso/DESIGN.md`, section 5). `scripts/stack-release.sh` doesn't know `--sso` today.
+Its `proof_checks` (`:751`) requires `--public-host`, `--auth-header` and `--allow-user` whenever a proof pair is
+carried, and the pointer's Console flags still hold the forward-auth pair (`--auth-header X-authentik-username
+--allow-user jason.woltje`) that `--sso` refuses to start with. So the window can't run through the script, and
+a hand-edited pointer is not an option.
+
+## What the row does
+
+1. `activate ID BUSINESS --sso` writes Console flags with `--sso` and without `--auth-header`, `--allow-user`
+   and any proof pair, and `--plan` names each flag it drops and carries, in the style of row 189's `send:`
+   line. The design names the full flag set the phase 2 Console starts with and checks it against row 192's
+   refusals.
+2. Before anything stops, the script refuses a target copy whose Console doesn't support `--sso`, and refuses
+   when the config's `console` key or its slot file fails the checks row 192's `--sso` start runs. It reads
+   neither value and only uses the same stat and shape checks.
+3. Rollback from an `--sso` pointer to a pre-phase-1 copy follows the design's phase 2 rollback order (remove
+   the `console` key first). The script refuses a rollback that would start a Console on a config it can't
+   read, and says which step comes first.
+4. `docs/TOOLS.md` gets the flag.
+
+## Boundaries
+
+- No change to the live pointer, units, `~/.mosaic-dev` or `~/.config/mosaic-dev`. Tests use scratch roots
+  and seeded pointers, as rows 187 and 189 do.
+- No request to the live Console, mosaic.woltje.com or auth.diversecanvas.com.
+
+## Gate
+
+Webby approves the manifest. The cli suite and every `scripts/test-*.sh` are green on Sage's gate, and the
+mutants are killed (one per refusal, and one that keeps `--auth-header` in the written flags).
@@ -33,7 +33,7 @@ Gaps found while working go to `docs/plans/DEFERRED.md`, not here.

 <!-- mosaic-queue:begin -->

-Generated from `docs/plans/queue.json` revision 2236 by `queue render`. Do not edit between the markers; change the queue with `scripts/mosaic queue`.
+Generated from `docs/plans/queue.json` revision 2247 by `queue render`. Do not edit between the markers; change the queue with `scripts/mosaic queue`.

 | # | Piece | Owner | Issues | State | After | Gate | Brief | Note |
 |---|---|---|---|---|---|---|---|---|
@@ -225,6 +225,9 @@ Generated from `docs/plans/queue.json` revision 2236 by `queue render`. Do not e
 | 186 | stack-release --plan: the backup line says what the run will do (P19 404, row 185 N1/N2) | darkwing; reviewers filbert | #1684 | done | — | Filbert approves the manifest; cli suite and every scripts/test-*.sh green on Sage's gate; the three brief mutants killed (sage) | `docs/plans/2026-10-20_plan-backup-line.md` § Brief: the activate plan's backup line says what the run will do | Landed 269134d8d (author Darkwing) on 3c5da3a91. Patch-id c97b9f6e25cd matches the r1 candidate (manifest 449e9121, Filbert approve 29419). Sage gate on b367f5730+patch 09:00:20Z-09:08:59Z: node 2681/0, scripts 422/0, queue 156, network removed; 3c5da3a91 adds only a SESSIONS line. Not live: the stack runs copy 490e2771d3d0. Follow-ups on P19 404: Filbert M6 gap, store-unclean reading. |
 | 187 | stack-release activate carries the row 178 proof pair (mos-0928 Part B A0) | darkwing; reviewers filbert | #1685 | done | 186 done | Filbert approves the manifest; cli suite and every scripts/test-*.sh green on Sage's gate; the brief mutants killed (sage) | `docs/plans/2026-10-20_activate-proof-pair.md` § Brief: activate carries the row 178 proof pair | Landed 9a71e4e80 (author Darkwing) on d17328a55; patch-id 6b57c47bc661 matches candidate 52a5ecc1d143 and Filbert's r1 reading. Sage gate passed 10:21:55Z: cli 446/446 and every package and scripts/test-*.sh green. Filbert approve 29424, rev 2204; follow-ups N1-N4 filed on P19. |
 | 188 | stack-release tests: a carried proof pair and a proof file inside the repository (P19 409, 410; gates Part B) | darkwing; reviewers filbert | #1686 | done | 187 settled | Filbert approves the manifest; cli suite and every scripts/test-*.sh green on Sage's gate; the brief mutants killed (sage) | `docs/plans/2026-10-20_proof-test-gaps.md` § Brief: tests for the two proof-file paths row 187 left open | Landed 8fc0ee216 (author Darkwing) on 23a609c5c; patch-id c9a56b167c07 matches candidate 86aa549bad75 and Filbert's r1 reading; stack-release.sh blob 2586a2a37cd2 unchanged. Sage gate passed 10:58Z: cli 453/453 and every package and scripts/test-*.sh green. Filbert approve 29433, rev 2212; N1 (REPO logical path) to P19 after Part B (mos-0959). |
+| 189 | stack-release activate --no-send drops the Console's --send and keeps the pointer in step (Q175 interim, mos-0972, P19 413) | sage; reviewers dewey | #1687 | in-review, round 1, request posted | 163 done | Dewey approves the manifest; cli suite and every scripts/test-*.sh green on Sage's gate; the brief mutants killed (sage) | `docs/plans/2026-10-20_activate-no-send.md` § Brief: activate --no-send drops the Console's --send | — |
+| 190 | several Mosaic Stack instances on one host: per-instance config, data root, units and ports (MVP T1.1, mos-0974, Vikunja #414) | darkwing; reviewers filbert | #1688 | in-progress | — | Filbert approves DESIGN.md then the manifest; cli suite and every scripts/test-*.sh green on Sage's gate; the design mutants killed (sage) | `docs/plans/2026-10-20_multi-instance.md` § Brief: several Mosaic Stack instances on one host | — |
+| 191 | one kill switch for the bus, every run, Discord and new launches, from the CLI and the Console (MVP T1.4, mos-0974, Vikunja #414) | rocko; reviewers dewey | #1689 | in-progress | — | Dewey approves DESIGN.md then the manifest; cli, bus, discord and webui suites and every scripts/test-*.sh green on Sage's gate; the mutants killed (sage) | `docs/plans/2026-10-20_kill-switch.md` § Brief: one kill switch for the bus, every run, Discord and new launches | — |

 <!-- mosaic-queue:end -->

@@ -1,7 +1,7 @@
 {
  "version": 1,
  "canonicalRoot": "/mnt/storage/src/mosaic-stack",
-  "revision": 2236,
+  "revision": 2247,
  "rows": [
    {
      "id": 1,
@@ -19820,6 +19820,153 @@
      "createdAt": "2026-10-20T10:31:30.403Z",
      "updatedAt": "2026-10-20T11:11:25.098Z",
      "updatedBy": "sage"
+    },
+    {
+      "id": 189,
+      "piece": "stack-release activate --no-send drops the Console's --send and keeps the pointer in step (Q175 interim, mos-0972, P19 413)",
+      "owner": "sage",
+      "issues": [
+        1687
+      ],
+      "closes": [
+        1687
+      ],
+      "state": "in-review",
+      "previousState": null,
+      "required": false,
+      "requiredSince": null,
+      "gate": "Dewey approves the manifest; cli suite and every scripts/test-*.sh green on Sage's gate; the brief mutants killed",
+      "gateOwner": "sage",
+      "brief": {
+        "path": "docs/plans/2026-10-20_activate-no-send.md",
+        "anchor": "Brief: activate --no-send drops the Console's --send",
+        "blob": "0444b774faf09084311357fdd59b0ef3a3d347eb"
+      },
+      "after": [
+        {
+          "id": 163,
+          "when": "done"
+        }
+      ],
+      "reviewers": [
+        "dewey"
+      ],
+      "review": {
+        "rounds": [
+          {
+            "n": 1,
+            "op": "sage-189-inreview-1",
+            "by": "sage",
+            "at": "2026-10-20T18:46:06.124Z",
+            "issue": 1687,
+            "candidate": {
+              "kind": "manifest",
+              "digest": "67af69bd579561fd8c20be2a47695240a9f09f119dbfff88a8e72e2a7416e668",
+              "text": "70dbc89c0282fa063514317262d8926d16b8b8aaab4a1e47379303918495fc2c  agents/sage/work/queue-189/BUILD.md\n4bd216cce2b40b39998725daa8989f6e3acb3ccd81a7017f6b09026af3965584  agents/sage/work/queue-189/mutants-run.log\nddbdddf03abf4aa91aa62f52e468be7af3c6b2f5d7bec2ee99b11e315471f18c  agents/sage/work/queue-189/mutants.sh\n5d7b2da84d994f4f93d1212e349b4e4c19c5c00780e6cfcde91edb3ca08c014e  docs/plans/2026-10-20_activate-no-send.md\n38e410c4cb731390f96747646eb7f6caa7a587fca9024ccbe901aab5ac19c7cf  docs/TOOLS.md\nfe430969cc669515e348fced1a22cbe839a12023f7ac67cfba905b7afd29872f  packages/cli/tests/stack-release.test.mjs\n16f77305e558f4fb953accc6d09f1f7b408aba363851d8ca79216ffce41bed9f  scripts/stack-release.sh\n"
+            },
+            "request": "comment",
+            "attempts": [
+              {
+                "op": "sage-189-inreview-1",
+                "by": "sage",
+                "at": "2026-10-20T18:46:06.124Z",
+                "state": "posted",
+                "comment": 29457,
+                "transport": {
+                  "outcome": "posted",
+                  "status": 201,
+                  "comment": 29457,
+                  "detail": "created"
+                },
+                "resolutions": []
+              }
+            ],
+            "duplicateRisk": false,
+            "receipts": []
+          }
+        ]
+      },
+      "claim": {
+        "seat": "sage",
+        "op": "sage-189-start"
+      },
+      "note": null,
+      "blockedReason": null,
+      "createdAt": "2026-10-20T18:21:38.646Z",
+      "updatedAt": "2026-10-20T18:46:24.267Z",
+      "updatedBy": "sage"
+    },
+    {
+      "id": 190,
+      "piece": "several Mosaic Stack instances on one host: per-instance config, data root, units and ports (MVP T1.1, mos-0974, Vikunja #414)",
+      "owner": "darkwing",
+      "issues": [
+        1688
+      ],
+      "closes": [
+        1688
+      ],
+      "state": "in-progress",
+      "previousState": null,
+      "required": false,
+      "requiredSince": null,
+      "gate": "Filbert approves DESIGN.md then the manifest; cli suite and every scripts/test-*.sh green on Sage's gate; the design mutants killed",
+      "gateOwner": "sage",
+      "brief": {
+        "path": "docs/plans/2026-10-20_multi-instance.md",
+        "anchor": "Brief: several Mosaic Stack instances on one host",
+        "blob": "79fa60fbf17a352edc5431d6aabc77c72ec5c48f"
+      },
+      "after": [],
+      "reviewers": [
+        "filbert"
+      ],
+      "review": null,
+      "claim": {
+        "seat": "darkwing",
+        "op": "darkwing-190-start"
+      },
+      "note": null,
+      "blockedReason": null,
+      "createdAt": "2026-10-20T18:42:48.052Z",
+      "updatedAt": "2026-10-20T18:45:23.430Z",
+      "updatedBy": "darkwing"
+    },
+    {
+      "id": 191,
+      "piece": "one kill switch for the bus, every run, Discord and new launches, from the CLI and the Console (MVP T1.4, mos-0974, Vikunja #414)",
+      "owner": "rocko",
+      "issues": [
+        1689
+      ],
+      "closes": [
+        1689
+      ],
+      "state": "in-progress",
+      "previousState": null,
+      "required": false,
+      "requiredSince": null,
+      "gate": "Dewey approves DESIGN.md then the manifest; cli, bus, discord and webui suites and every scripts/test-*.sh green on Sage's gate; the mutants killed",
+      "gateOwner": "sage",
+      "brief": {
+        "path": "docs/plans/2026-10-20_kill-switch.md",
+        "anchor": "Brief: one kill switch for the bus, every run, Discord and new launches",
+        "blob": "aed33125fa67ae69af73c18ffc9e2a83481421f3"
+      },
+      "after": [],
+      "reviewers": [
+        "dewey"
+      ],
+      "review": null,
+      "claim": {
+        "seat": "rocko",
+        "op": "rocko-191-start"
+      },
+      "note": null,
+      "blockedReason": null,
+      "createdAt": "2026-10-20T18:43:05.222Z",
+      "updatedAt": "2026-10-20T18:45:05.621Z",
+      "updatedBy": "rocko"
    }
  ],
  "log": [
@@ -78756,6 +78903,329 @@
        "receipt": "ok sage-163-done rev 2236 row 163 in-review→done round 2"
      },
      "viewSha": "e44815d32d46b91ee37d4c3c4701716956ba35d29c16c24c89020cce345bd61b"
+    },
+    {
+      "rev": 2237,
+      "op": "sage-189-add",
+      "verb": "add",
+      "args": {
+        "piece": "stack-release activate --no-send drops the Console's --send and keeps the pointer in step (Q175 interim, mos-0972, P19 413)",
+        "gate": "Dewey approves the manifest; cli suite and every scripts/test-*.sh green on Sage's gate; the brief mutants killed",
+        "brief": "docs/plans/2026-10-20_activate-no-send.md#Brief: activate --no-send drops the Console's --send",
+        "issues": [
+          1687
+        ],
+        "note": null,
+        "owner": "sage",
+        "gateOwner": "sage",
+        "after": [
+          {
+            "id": 163,
+            "when": "done"
+          }
+        ],
+        "reviewers": [
+          "dewey"
+        ],
+        "required": null
+      },
+      "by": "sage",
+      "at": "2026-10-20T18:21:38.646Z",
+      "semantics": 2,
+      "result": {
+        "row": 189,
+        "from": null,
+        "to": "queued",
+        "brief": {
+          "path": "docs/plans/2026-10-20_activate-no-send.md",
+          "anchor": "Brief: activate --no-send drops the Console's --send",
+          "blob": "0444b774faf09084311357fdd59b0ef3a3d347eb"
+        },
+        "receipt": "ok sage-189-add rev 2237 row 189 none→queued"
+      },
+      "viewSha": "70bf9967156881afecaba9ccf4edf8cbc63a344eb7c6407b3453c950781f34c5"
+    },
+    {
+      "rev": 2238,
+      "op": "sage-189-briefed",
+      "verb": "move",
+      "args": {
+        "id": 189,
+        "to": "briefed",
+        "reason": null,
+        "candidate": null,
+        "evidence": null,
+        "issue": null
+      },
+      "by": "sage",
+      "at": "2026-10-20T18:22:01.437Z",
+      "semantics": 2,
+      "result": {
+        "row": 189,
+        "from": "queued",
+        "to": "briefed",
+        "round": null,
+        "issue": null,
+        "candidate": null,
+        "receipt": "ok sage-189-briefed rev 2238 row 189 queued→briefed"
+      },
+      "viewSha": "27ee8a26722d3eaf4c4b346e06ffdb853037aad2d1a7fe14f440cbe1bb9a2a27"
+    },
+    {
+      "rev": 2239,
+      "op": "sage-189-start",
+      "verb": "move",
+      "args": {
+        "id": 189,
+        "to": "in-progress",
+        "reason": null,
+        "candidate": null,
+        "evidence": null,
+        "issue": null
+      },
+      "by": "sage",
+      "at": "2026-10-20T18:22:18.476Z",
+      "semantics": 2,
+      "result": {
+        "row": 189,
+        "from": "briefed",
+        "to": "in-progress",
+        "round": null,
+        "issue": null,
+        "candidate": null,
+        "receipt": "ok sage-189-start rev 2239 row 189 briefed→in-progress"
+      },
+      "viewSha": "230578585341fcfc9429364332ca8b78988ffd669d3c1bb5e2e94a74d9916649"
+    },
+    {
+      "rev": 2240,
+      "op": "sage-190-add",
+      "verb": "add",
+      "args": {
+        "piece": "several Mosaic Stack instances on one host: per-instance config, data root, units and ports (MVP T1.1, mos-0974, Vikunja #414)",
+        "gate": "Filbert approves DESIGN.md then the manifest; cli suite and every scripts/test-*.sh green on Sage's gate; the design mutants killed",
+        "brief": "docs/plans/2026-10-20_multi-instance.md#Brief: several Mosaic Stack instances on one host",
+        "issues": [
+          1688
+        ],
+        "note": null,
+        "owner": "darkwing",
+        "gateOwner": "sage",
+        "after": null,
+        "reviewers": [
+          "filbert"
+        ],
+        "required": null
+      },
+      "by": "sage",
+      "at": "2026-10-20T18:42:48.052Z",
+      "semantics": 2,
+      "result": {
+        "row": 190,
+        "from": null,
+        "to": "queued",
+        "brief": {
+          "path": "docs/plans/2026-10-20_multi-instance.md",
+          "anchor": "Brief: several Mosaic Stack instances on one host",
+          "blob": "79fa60fbf17a352edc5431d6aabc77c72ec5c48f"
+        },
+        "receipt": "ok sage-190-add rev 2240 row 190 none→queued"
+      },
+      "viewSha": "b4319dbd993254b58e4db8be18769b04322028903e325c0c8cadcfdec527929f"
+    },
+    {
+      "rev": 2241,
+      "op": "sage-191-add",
+      "verb": "add",
+      "args": {
+        "piece": "one kill switch for the bus, every run, Discord and new launches, from the CLI and the Console (MVP T1.4, mos-0974, Vikunja #414)",
+        "gate": "Dewey approves DESIGN.md then the manifest; cli, bus, discord and webui suites and every scripts/test-*.sh green on Sage's gate; the mutants killed",
+        "brief": "docs/plans/2026-10-20_kill-switch.md#Brief: one kill switch for the bus, every run, Discord and new launches",
+        "issues": [
+          1689
+        ],
+        "note": null,
+        "owner": "rocko",
+        "gateOwner": "sage",
+        "after": null,
+        "reviewers": [
+          "dewey"
+        ],
+        "required": null
+      },
+      "by": "sage",
+      "at": "2026-10-20T18:43:05.222Z",
+      "semantics": 2,
+      "result": {
+        "row": 191,
+        "from": null,
+        "to": "queued",
+        "brief": {
+          "path": "docs/plans/2026-10-20_kill-switch.md",
+          "anchor": "Brief: one kill switch for the bus, every run, Discord and new launches",
+          "blob": "aed33125fa67ae69af73c18ffc9e2a83481421f3"
+        },
+        "receipt": "ok sage-191-add rev 2241 row 191 none→queued"
+      },
+      "viewSha": "2cdc7c37430226f1ea01ed9f3d60a2c12be16eddac38d18dc16f889c7b54b14e"
+    },
+    {
+      "rev": 2242,
+      "op": "sage-190-brief",
+      "verb": "move",
+      "args": {
+        "id": 190,
+        "to": "briefed",
+        "reason": null,
+        "candidate": null,
+        "evidence": null,
+        "issue": null
+      },
+      "by": "sage",
+      "at": "2026-10-20T18:43:25.630Z",
+      "semantics": 2,
+      "result": {
+        "row": 190,
+        "from": "queued",
+        "to": "briefed",
+        "round": null,
+        "issue": null,
+        "candidate": null,
+        "receipt": "ok sage-190-brief rev 2242 row 190 queued→briefed"
+      },
+      "viewSha": "6203315b484302369ce5ea7d854082a6bca4a95f9793e14ec123f57381234c95"
+    },
+    {
+      "rev": 2243,
+      "op": "sage-191-brief",
+      "verb": "move",
+      "args": {
+        "id": 191,
+        "to": "briefed",
+        "reason": null,
+        "candidate": null,
+        "evidence": null,
+        "issue": null
+      },
+      "by": "sage",
+      "at": "2026-10-20T18:43:43.042Z",
+      "semantics": 2,
+      "result": {
+        "row": 191,
+        "from": "queued",
+        "to": "briefed",
+        "round": null,
+        "issue": null,
+        "candidate": null,
+        "receipt": "ok sage-191-brief rev 2243 row 191 queued→briefed"
+      },
+      "viewSha": "9cc7dda5fa676258e864dedfdf2f4e3904c8723ba9c36474cff76757f52e5c07"
+    },
+    {
+      "rev": 2244,
+      "op": "rocko-191-start",
+      "verb": "move",
+      "args": {
+        "id": 191,
+        "to": "in-progress",
+        "reason": null,
+        "candidate": null,
+        "evidence": null,
+        "issue": null
+      },
+      "by": "rocko",
+      "at": "2026-10-20T18:45:05.621Z",
+      "semantics": 2,
+      "result": {
+        "row": 191,
+        "from": "briefed",
+        "to": "in-progress",
+        "round": null,
+        "issue": null,
+        "candidate": null,
+        "receipt": "ok rocko-191-start rev 2244 row 191 briefed→in-progress"
+      },
+      "viewSha": "cd2423e53ac82a667c737852bef6adfdafba82987f37cd090f5484b15b3a0e0c"
+    },
+    {
+      "rev": 2245,
+      "op": "darkwing-190-start",
+      "verb": "move",
+      "args": {
+        "id": 190,
+        "to": "in-progress",
+        "reason": null,
+        "candidate": null,
+        "evidence": null,
+        "issue": null
+      },
+      "by": "darkwing",
+      "at": "2026-10-20T18:45:23.430Z",
+      "semantics": 2,
+      "result": {
+        "row": 190,
+        "from": "briefed",
+        "to": "in-progress",
+        "round": null,
+        "issue": null,
+        "candidate": null,
+        "receipt": "ok darkwing-190-start rev 2245 row 190 briefed→in-progress"
+      },
+      "viewSha": "014db845fb2e380678ab1250f2cd3c0d7b192dc39909416515482c810440149b"
+    },
+    {
+      "rev": 2246,
+      "op": "sage-189-inreview-1",
+      "verb": "move",
+      "args": {
+        "id": 189,
+        "to": "in-review",
+        "reason": null,
+        "candidate": "agents/sage/work/queue-189/candidate-manifest.sha256",
+        "evidence": null,
+        "issue": null
+      },
+      "by": "sage",
+      "at": "2026-10-20T18:46:06.124Z",
+      "semantics": 2,
+      "result": {
+        "row": 189,
+        "from": "in-progress",
+        "to": "in-review",
+        "round": 1,
+        "issue": 1687,
+        "candidate": {
+          "kind": "manifest",
+          "digest": "67af69bd579561fd8c20be2a47695240a9f09f119dbfff88a8e72e2a7416e668",
+          "text": "70dbc89c0282fa063514317262d8926d16b8b8aaab4a1e47379303918495fc2c  agents/sage/work/queue-189/BUILD.md\n4bd216cce2b40b39998725daa8989f6e3acb3ccd81a7017f6b09026af3965584  agents/sage/work/queue-189/mutants-run.log\nddbdddf03abf4aa91aa62f52e468be7af3c6b2f5d7bec2ee99b11e315471f18c  agents/sage/work/queue-189/mutants.sh\n5d7b2da84d994f4f93d1212e349b4e4c19c5c00780e6cfcde91edb3ca08c014e  docs/plans/2026-10-20_activate-no-send.md\n38e410c4cb731390f96747646eb7f6caa7a587fca9024ccbe901aab5ac19c7cf  docs/TOOLS.md\nfe430969cc669515e348fced1a22cbe839a12023f7ac67cfba905b7afd29872f  packages/cli/tests/stack-release.test.mjs\n16f77305e558f4fb953accc6d09f1f7b408aba363851d8ca79216ffce41bed9f  scripts/stack-release.sh\n"
+        },
+        "receipt": "ok sage-189-inreview-1 rev 2246 row 189 in-progress→in-review round 1 on #1687; request sage-189-inreview-1 requesting"
+      },
+      "viewSha": "d8a3aa936a9a819329e86679d0bfcf658d773d0f7cfd29c10587c6447f78e968"
+    },
+    {
+      "rev": 2247,
+      "op": "sage-189-inreview-1.outcome",
+      "verb": "review-outcome",
+      "args": {
+        "id": 189,
+        "attempt": "sage-189-inreview-1",
+        "outcome": "posted",
+        "status": 201,
+        "comment": 29457,
+        "detail": "created"
+      },
+      "by": "sage",
+      "at": "2026-10-20T18:46:24.267Z",
+      "semantics": 2,
+      "result": {
+        "row": 189,
+        "round": 1,
+        "attempt": "sage-189-inreview-1",
+        "state": "posted",
+        "receipt": "ok sage-189-inreview-1.outcome rev 2247 row 189 round 1 request sage-189-inreview-1 posted comment 29457"
+      },
+      "viewSha": "6d7e91ae3cab0b76e5c5d791fb821b97c9da7db16389ff2d531d7b77d2a069f1"
    }
  ]
 }
@@ -9,7 +9,8 @@
      "version": "0.0.3",
      "license": "UNLICENSED",
      "dependencies": {
-        "@earendil-works/pi-coding-agent": "0.85.1"
+        "@earendil-works/pi-coding-agent": "0.85.1",
+        "oauth4webapi": "3.8.8"
      }
    },
    "node_modules/@anthropic-ai/sdk": {
@@ -1933,6 +1934,15 @@
        "url": "https://opencollective.com/node-fetch"
      }
    },
+    "node_modules/oauth4webapi": {
+      "version": "3.8.8",
+      "resolved": "https://registry.npmjs.org/oauth4webapi/-/oauth4webapi-3.8.8.tgz",
+      "integrity": "sha512-8N28E+a/oxfXWBgOMt+ZP/JUf/XR+IFbvkAEPP3gznXOMv9BpAAwiIj0TFNz3tGTPc0ZQ8zmWBNgN1nAys0gng==",
+      "license": "MIT",
+      "funding": {
+        "url": "https://github.com/sponsors/panva"
+      }
+    },
    "node_modules/openai": {
      "version": "6.40.0",
      "resolved": "https://registry.npmjs.org/openai/-/openai-6.40.0.tgz",
@@ -5,6 +5,7 @@
  "description": "Minimal Mosaic Stack container proof of concept: one Pi agent, four local contract files, one real model request returning MOSAIC_HELLO_OK.",
  "license": "UNLICENSED",
  "dependencies": {
-    "@earendil-works/pi-coding-agent": "0.85.1"
+    "@earendil-works/pi-coding-agent": "0.85.1",
+    "oauth4webapi": "3.8.8"
  }
 }
@@ -12,6 +12,7 @@ import {tmpdir} from 'node:os';
 import {join,dirname,basename} from 'node:path';
 import {fileURLToPath,pathToFileURL} from 'node:url';
 import {once} from 'node:events';
+import {ALGS} from '../../webui/src/sso-config.mjs';

 const ROOT=fileURLToPath(new URL('../../..',import.meta.url)).replace(/\/$/,'');
 const NODE=process.execPath;
@@ -260,9 +261,17 @@ const storeText=(v,froms,to=true)=>`export const SCHEMA_VERSION = '${v}';\nexpor
 const KINDS_NEW=readFileSync(join(repo,'packages','plugins','src','kinds.mjs'),'utf8');
 const KINDS_OLD=KINDS_NEW.replace('\n  harness: Object.freeze({','\n  "harness-before-c216f47db": Object.freeze({');
 assert.notEqual(KINDS_OLD,KINDS_NEW);
+// Row 200 (#1698): C1 and C take --sso and have the row 192 loader and checkConsole; C's checker
+// refuses RS256, a stand-in for a target whose rules differ from the repository's. B has the loader
+// from before row 192, which refuses a `console` key. The other copies have no loader.
+const LOADER=readFileSync(join(repo,'scripts','mosaic-config.mjs'),'utf8'),SSO_CONFIG=readFileSync(join(repo,'packages','webui','src','sso-config.mjs'),'utf8');
+const LOADER_OLD=LOADER.replace('["configVersion", "environment", "dataRoot", "execution", "console"]','["configVersion", "environment", "dataRoot", "execution"]');
+const SSO_CONFIG_C=SSO_CONFIG.replace("'ES256', 'RS256',","'ES256',");
+assert.notEqual(LOADER_OLD,LOADER);assert.notEqual(SSO_CONFIG_C,SSO_CONFIG);
+const ssoFiles=(id)=>id===B?[['scripts/mosaic-config.mjs',LOADER_OLD]]:[C1,C].includes(id)?[['scripts/mosaic-config.mjs',LOADER],['packages/webui/src/sso-config.mjs',id===C?SSO_CONFIG_C:SSO_CONFIG]]:[];
 for(const [id,store] of [[F,'// a copy from before SCHEMA_VERSION\n'],[A,storeText('3g',['3f'],'3x')],[B,storeText('3g',['3f'])],[C1,storeText('3g',['3f'],false)],[C,storeText('3h',['3f','3g'])],[S,storeText('3g',['3f'])],[U,storeText('3g',['3f'])]]){
 const d=join(COPIES,id);
- for(const [f,text,mode] of [['scripts/mosaic',script(mosaicStub),0o755],['packages/webui/src/cli.mjs',[B,C1,C].includes(id)?"// fixture Console, never run\n// serve accepts '--tester-port'\n// serve accepts '--proof-header' (row 178)\n":'// fixture Console before tester listener, never run\n',0o644],['packages/bus/src/store.mjs',store,0o644],['packages/bus/src/migrate-schema.mjs',`(${migrateStub})();\n`,0o644],['packages/plugins/src/kinds.mjs',[C1,C].includes(id)?KINDS_NEW:KINDS_OLD,0o644]]){
+ for(const [f,text,mode] of [['scripts/mosaic',script(mosaicStub),0o755],['packages/webui/src/cli.mjs',[B,C1,C].includes(id)?`// fixture Console, never run\n// serve accepts '--tester-port'\n// serve accepts '--proof-header' (row 178)\n${[C1,C].includes(id)?"// serve accepts '--sso' (row 192)\n":''}`:'// fixture Console before tester listener, never run\n',0o644],['packages/bus/src/store.mjs',store,0o644],['packages/bus/src/migrate-schema.mjs',`(${migrateStub})();\n`,0o644],['packages/plugins/src/kinds.mjs',[C1,C].includes(id)?KINDS_NEW:KINDS_OLD,0o644],...ssoFiles(id).map(([f,text])=>[f,text,0o644])]){
  mkdirSync(dirname(join(d,f)),{recursive:true});writeFileSync(join(d,f),text,{mode});
 }
 for(const p of ['packages/business/src','roles'])cpSync(join(repo,p),join(d,p),{recursive:true});
@@ -381,7 +390,7 @@ async function seed(e,{copy=B,pm=false,store='3g',pointer:how='adopt'}={}){
 const rolledBack=(code,to=B)=>`stack-release: ${code}; rolled back to ${to}, which passed the gate\n`;
 const planBackup=(e)=>`backup: the run backs up the stopped store to ${e.data}/backups/stack/<activation>/ before any migration`;
 const planNoBackup='backup: none; the run rolls back before the backup';
-const planTail=(e,to,pm=false)=>[`bus: scripts/bus-service.sh install --copy ${to} --copies ${COPIES}${pm?' --pm':''} --claude ${e.claude}`,'proof: off',`Console: scripts/webui-service.sh install --copy ${to} --copies ${COPIES} --port ${e.port} --business acme`,`CLI: scripts/stack-copy.sh wrapper ${to} --copies ${COPIES} --bin ${e.bin}`];
+const planTail=(e,to,pm=false)=>[`bus: scripts/bus-service.sh install --copy ${to} --copies ${COPIES}${pm?' --pm':''} --claude ${e.claude}`,'proof: off','send: off',`Console: scripts/webui-service.sh install --copy ${to} --copies ${COPIES} --port ${e.port} --business acme`,`CLI: scripts/stack-copy.sh wrapper ${to} --copies ${COPIES} --bin ${e.bin}`];

 // --- The T table ---

@@ -1030,17 +1039,17 @@ test('T36 --plan shows the pending state and lists the row 169 refusals it can s
  return r.out.split('\n');
 };
 let out=await quiet(0,'activate',C1,'acme','--pm-after-harness','--plan');
- assert.deepEqual(out.slice(-6),['pm: the bus starts without --pm and the PM stays pending; next: Jason\'s plugins set of harness, then pm-on',...planTail(e,C1),'']);
+ assert.deepEqual(out.slice(-7),['pm: the bus starts without --pm and the PM stays pending; next: Jason\'s plugins set of harness, then pm-on',...planTail(e,C1),'']);
 biz(e,HARNESS);
 out=await quiet(3,'activate',A,'acme','--pm-after-harness','--plan');
- assert.deepEqual(out.slice(-7),['pm: the bus starts without --pm and the PM stays pending; next: Jason\'s plugins set of harness, then pm-on',...planTail(e,A),`refuses unknown-kind-for-target: the business file names plug-in kind(s) harness, which ${A} does not know`,'']);
+ assert.deepEqual(out.slice(-8),['pm: the bus starts without --pm and the PM stays pending; next: Jason\'s plugins set of harness, then pm-on',...planTail(e,A),`refuses unknown-kind-for-target: the business file names plug-in kind(s) harness, which ${A} does not know`,'']);
 out=await quiet(3,'activate',C1,'acme','--pm-after-harness','--plan');
 assert.equal(out.at(-2),'refuses pm-after-harness-set: the business file already sets harness ["claude-code"]; use --pm');
 biz(e);assert.equal((await run(e,'activate',C1,'acme','--pm-after-harness')).code,0);
 out=await quiet(3,'activate',C,'acme','--plan');
- assert.deepEqual(out.slice(-7),['pm: the pointer is pending (activate --pm-after-harness); the bus runs without its PM',...planTail(e,C,true),`refuses pm-pending: ${PENDING_MSG}`,'']);
+ assert.deepEqual(out.slice(-8),['pm: the pointer is pending (activate --pm-after-harness); the bus runs without its PM',...planTail(e,C,true),`refuses pm-pending: ${PENDING_MSG}`,'']);
 out=await quiet(0,'rollback','acme','--plan');
- assert.deepEqual(out.slice(-6),['pm: the pointer is pending (activate --pm-after-harness); the bus runs without its PM',...planTail(e,B,true),'']);
+ assert.deepEqual(out.slice(-7),['pm: the pointer is pending (activate --pm-after-harness); the bus runs without its PM',...planTail(e,B,true),'']);
 });

 // Row 176 test 11: supported and older Console copies deliberately differ from the checkout.
@@ -1706,6 +1715,327 @@ test('T54 row 188: a carried pair gets the proof file checks, and a proof file i
 });
 });

+// Row 189 (#1687, mos-0972/0973): activate --no-send drops the pointer's --send; nothing turns it back on.
+const sendLines=(out)=>out.filter((l)=>l.startsWith('send:'));
+const noSend=(c)=>c.filter((x)=>x!=='--send');
+const LIVE_NOTE=`note: ${B} is the pointer's copy; the run re-pins it and only the Console flags change`;
+test('T55 row 189: activate --no-send drops --send, and rollback and pm-on carry it off',async(t)=>{
+ await t.test('test 1: a live-copy --no-send drops --send from the pointer and the unit, keeps the rest in order, logs the step and backs up the stopped store',async(t)=>{
+  const e=await mk(t),base=await seedPreview(e,undefined,['--send','--tester-port','7333']),want=noSend(base);
+  assert.deepEqual(want.slice(-2),['--tester-port','7333']);
+  const sum=createHash('sha256').update(readFileSync(e.store)).digest('hex'),n=calls(e).length;
+  let r=await prun(e,'activate',B,'acme','--no-send');assert.equal(r.code,0,r.out+r.err);
+  assert.equal(pointer(e).copy,B);assert.deepEqual(pointer(e).console,want);
+  assert.ok(conExec(e).endsWith(` --checkout ${repo} ${want.join(' ')}`),conExec(e));assert.doesNotMatch(conExec(e),/ --send( |$)/);
+  r=await prun(e,'status','acme');assert.equal(r.code,0,r.err);assert.match(r.out,/unit flags: match the pointer/);
+  assert.match(stepText(e),/Z drop --send; --no-send was given\n/);
+  const act=pointer(e).activation,l=logLines(e).at(-1);
+  assert.deepEqual([l.op,l.from,l.to,l.result,l.backup],['activate',B,B,'ok',act]);assert.equal(backupSum(e,act),sum);
+  assert.deepEqual(startsStops(e,n),[`stop ${CON}`,`stop ${BUS}`,`start ${BUS}`,`start ${CON}`]);
+  await noLeak(e);
+ });
+ await t.test('test 2: a plain live-copy activate still refuses already-active, and so does --no-send once --send is gone',async(t)=>{
+  const e=await mk(t);await seedPreview(e,undefined,['--send']);
+  await refused(e,['activate',B,'acme'],'already-active',`${B} is the pointer's copy`);
+  await refused(e,['activate',B,'acme','--tester-port','7333'],'already-active',`${B} is the pointer's copy`);
+  await refused(e,['activate',B,'acme','--no-proof'],'already-active',`${B} is the pointer's copy`);
+  const r=await prun(e,'activate',B,'acme','--no-send');assert.equal(r.code,0,r.out+r.err);
+  await refused(e,['activate',B,'acme','--no-send'],'already-active',`${B} is the pointer's copy`);
+  const g=await mk(t);await seedPreview(g);
+  await refused(g,['activate',B,'acme','--no-send'],'already-active',`${B} is the pointer's copy`);
+  for(const x of [e,g])await noLeak(x);
+ });
+ await t.test('test 3: --plan prints one send: line in each case, with the live-copy note on a same-copy run',async(t)=>{
+  const e=await mk(t),base=await seedPreview(e,undefined,['--send']);
+  let out=await planOnly(e,0,'activate',B,'acme','--no-send');
+  assert.deepEqual(sendLines(out),['send: dropped; --no-send was given']);
+  assert.deepEqual(out.filter((l)=>l.startsWith('note: ')),[LIVE_NOTE]);
+  assert.equal(out[out.indexOf('send: dropped; --no-send was given')+1],`Console: scripts/webui-service.sh install --copy ${B} --copies ${COPIES} ${noSend(base).join(' ')}`);
+  out=await planOnly(e,0,'activate',C1,'acme');
+  assert.deepEqual(sendLines(out),['send: carried']);assert.deepEqual(out.filter((l)=>l.startsWith('note: ')),[]);
+  assert.ok(out.find((l)=>l.startsWith('Console: ')).endsWith(' --send'));
+  assert.deepEqual(sendLines(await planOnly(e,0,'activate',C1,'acme','--no-send')),['send: dropped; --no-send was given']);
+  let r=await prun(e,'activate',C1,'acme','--no-send');assert.equal(r.code,0,r.out+r.err);
+  assert.deepEqual(pointer(e).console,noSend(base));assert.match(stepText(e),/Z drop --send; --no-send was given\n/);
+  assert.deepEqual(sendLines(await planOnly(e,0,'activate',B,'acme','--no-send')),['send: off; --no-send was given and the pointer holds no --send']);
+  assert.deepEqual(sendLines(await planOnly(e,0,'activate',B,'acme')),['send: off']);
+  assert.deepEqual(sendLines(await planOnly(e,0,'rollback','acme')),['send: off']);
+  r=await prun(e,'activate',B,'acme','--no-send');assert.equal(r.code,0,r.out+r.err);
+  assert.match(stepText(e),/Z --no-send was given and the pointer holds no --send, so there is nothing to drop\n/);
+  assert.doesNotMatch(stepText(e),/drop --send/);
+  await noLeak(e);
+ });
+ await t.test('test 4: after --no-send, a rollback to the earlier copy leaves --send out of the pointer and the unit',async(t)=>{
+  const e=await mk(t),base=await seedPreview(e,undefined,['--send']);
+  let r=await prun(e,'activate',C1,'acme','--no-send');assert.equal(r.code,0,r.out+r.err);
+  r=await prun(e,'rollback','acme');assert.equal(r.code,0,r.out+r.err);
+  assert.equal(pointer(e).copy,B);assert.deepEqual(pointer(e).console,noSend(base));assert.doesNotMatch(conExec(e),/ --send( |$)/);
+  assert.doesNotMatch(stepText(e),/--send/);
+  r=await prun(e,'status','acme');assert.equal(r.code,0,r.err);assert.match(r.out,/unit flags: match the pointer/);
+  await noLeak(e);
+ });
+ await t.test('test 4: pm-on after --no-send keeps --send off',async(t)=>{
+  const e=await mk(t),base=await seedPreview(e,{pm:true},['--send']);
+  let r=await prun(e,'activate',C1,'acme','--pm-after-harness','--no-send');assert.equal(r.code,0,r.out+r.err);
+  biz(e,HARNESS);
+  r=await prun(e,'pm-on','acme');assert.equal(r.code,0,r.out+r.err);
+  assert.equal(pointer(e).pm,true);assert.deepEqual(pointer(e).console,noSend(base));assert.doesNotMatch(conExec(e),/ --send( |$)/);
+  r=await prun(e,'status','acme');assert.equal(r.code,0,r.err);assert.match(r.out,/unit flags: match the pointer/);
+  await noLeak(e);
+ });
+ await t.test('test 5: --no-send on rollback, pm-on, status, adopt or rehearse is a usage error',async(t)=>{
+  const e=await mk(t);await seedPreview(e,undefined,['--send']);
+  const usageText=(await prun(e,'--help')).err,n=calls(e).length,logs=logLines(e).length,before=fp(e);
+  for(const args of [['rollback','acme','--no-send'],['rollback','acme','--plan','--no-send'],['pm-on','acme','--no-send'],['status','acme','--no-send'],['adopt','acme','--no-send'],
+   ['rehearse','acme','--backup','/tmp/x','--port','7400','--no-send']]){
+   const r=await prun(e,...args);assert.equal(r.code,4,args.join(' '));assert.equal(r.out,'');assert.equal(r.err,usageText);
+  }
+  assert.match(usageText,/\| --no-proof\] \[--no-send\]/);
+  assert.deepEqual(fp(e),before);assert.deepEqual(startsStops(e,n),[]);assert.equal(logLines(e).length,logs);
+  await noLeak(e);
+ });
+ await t.test('test 6: with both a pair and --send in the pointer, --no-send and --no-proof each drop what they name and keep the rest',async(t)=>{
+  const e=await mk(t),base=await seedPreview(e,undefined,['--send']),pre=noSend(base),f=await proofFile(e),g=await proofFile(e,'proof2.189',0o400);
+  let r=await prun(e,'activate',B,'acme',...pair(f));assert.equal(r.code,0,r.out+r.err);
+  assert.deepEqual(pointer(e).console,[...pre,...pair(f),'--send']);
+  let out=await planOnly(e,0,'activate',C1,'acme','--no-proof');
+  assert.deepEqual([...proofLines(out),...sendLines(out)],['proof: dropped; --no-proof drops header x-console-proof','send: carried']);
+  out=await planOnly(e,0,'activate',C1,'acme','--no-send');
+  assert.deepEqual([...proofLines(out),...sendLines(out)],['proof: carried, header x-console-proof','send: dropped; --no-send was given']);
+  out=await planOnly(e,0,'activate',B,'acme','--no-send','--no-proof');
+  assert.deepEqual([...proofLines(out),...sendLines(out)],['proof: dropped; --no-proof drops header x-console-proof','send: dropped; --no-send was given']);
+  r=await prun(e,'activate',C1,'acme','--no-send');assert.equal(r.code,0,r.out+r.err);
+  assert.deepEqual(pointer(e).console,[...pre,...pair(f)]);
+  r=await prun(e,'activate',C1,'acme','--no-send',...pair(g,'X-Proof-Two'));assert.equal(r.code,0,r.out+r.err);
+  assert.deepEqual(pointer(e).console,[...pre,...pair(g,'X-Proof-Two')]);
+  r=await prun(e,'status','acme');assert.equal(r.code,0,r.err);assert.match(r.out,/unit flags: match the pointer/);
+  const h=await mk(t),hbase=await seedPreview(h,undefined,['--send']),hpre=noSend(hbase),k=await proofFile(h);
+  r=await prun(h,'activate',B,'acme',...pair(k));assert.equal(r.code,0,r.out+r.err);
+  r=await prun(h,'activate',C1,'acme','--no-proof');assert.equal(r.code,0,r.out+r.err);
+  assert.deepEqual(pointer(h).console,[...hpre,'--send']);
+  r=await prun(h,'activate',C1,'acme','--no-send','--no-proof');assert.equal(r.code,0,r.out+r.err);
+  assert.deepEqual(pointer(h).console,hpre);assert.doesNotMatch(conExec(h),/--proof-| --send( |$)/);
+  const steps=stepText(h);
+  assert.match(steps,/Z --no-proof was given and the pointer holds no proof pair, so there is nothing to drop\n/);assert.match(steps,/Z drop --send; --no-send was given\n/);
+  r=await prun(h,'status','acme');assert.equal(r.code,0,r.err);assert.match(r.out,/unit flags: match the pointer/);
+  for(const x of [e,h])await noLeak(x);
+ });
+});
+
+// Row 200 (#1698): activate --sso. The config gets console.sso with one provider `a`, and its slot
+// file sits where cli.mjs's readSlot looks, beside the config, with a read watch: the run may stat
+// it but never open it. ES256 passes every copy's checker; RS256 passes C1's and fails C's.
+const SLOT='console-sso-a';
+const slotPath=(e)=>join(dirname(e.cfg),'secrets','mosaic-stack',SLOT);
+const SSO_KEY={sso:{publicOrigin:'https://console.example.test',providers:[{id:'a',issuer:'https://op.example.test/',clientId:'mosaic-console',clientSecret:{slot:SLOT},algs:['ES256'],subjects:[{sub:'subject-1',name:'jason'}]}]}};
+function setKey(e,key){const c=JSON.parse(readFileSync(e.cfg,'utf8'));if(key===undefined)delete c.console;else c.console=key;writeFileSync(e.cfg,JSON.stringify(c))}
+async function ssoConfig(e,{key=SSO_KEY,slot=true}={}){
+ setKey(e,key);mkdirSync(dirname(slotPath(e)),{recursive:true,mode:0o700});
+ return slot?proofFile(e,SLOT,0o600,dirname(slotPath(e))):slotPath(e);
+}
+const ssoLines=(out)=>out.filter((l)=>l.startsWith('sso:'));
+const DROPS='--public-host console.example --auth-header x-user --allow-user jason';
+const SHOW=`show-${CON}.txt`;
+const setOf=(e,act)=>join(e.state,'stack-rollback',act);
+const arrivalSet=(e,to)=>setOf(e,logLines(e).findLast((l)=>l.result==='ok'&&l.to===to&&l.from!==to).activation);
+const ROLLBACK_PLAN=(set)=>`sso: dropped; ${B}'s Console does not support --sso, so the rollback takes the Console flags from ${set}/${SHOW}, with --send and --tester-port as the pointer has them`;
+const KEY_MSG=(e,to,op,why)=>`${e.cfg} holds a console key, and ${to}'s loader refuses it (${why}); remove the key first (restore the config.json backup from the window's step 1), then run the ${op} again`;
+const RB_MSG=(why)=>`${B}'s Console does not support --sso, and the Console flags it ran with cannot be read: ${why}`;
+// Rewrites a file in a rollback set (0700, files kept by cp -p) and, unless sums is false, its SHA256SUMS line.
+function setEdit(set,name,from,to,sums=true){
+ const f=join(set,name);chmodSync(set,0o700);chmodSync(f,0o600);edit(f,from,to);
+ if(sums){const s=join(set,'SHA256SUMS');chmodSync(s,0o600);writeFileSync(s,readFileSync(s,'utf8').replace(new RegExp(`^[0-9a-f]{64}(  \\./${name.replace(/[.@]/g,'\\$&')})$`,'m'),`${sha(f)}$1`))}
+}
+
+test('T56 row 200: activate --sso, its refusals before any stop, and the rollback to a Console without --sso',async(t)=>{
+ await t.test('item 1: --sso drops the preview set and the pair, puts --sso before --send and the tester port, and the plan names what it drops and carries',async(t)=>{
+  const e=await mk(t),base=await seedPreview(e,undefined,['--send']),f=await proofFile(e),pre=noSend(base);
+  let r=await prun(e,'activate',B,'acme','--tester-port','7333',...pair(f));assert.equal(r.code,0,r.out+r.err);
+  assert.deepEqual(pointer(e).console,[...pre,...pair(f),'--send','--tester-port','7333']);
+  await ssoConfig(e);
+  const want=['--port',e.port,'--business','acme','--sso','--send','--tester-port','7333'];
+  const out=await planOnly(e,0,'activate',C1,'acme','--sso');
+  assert.deepEqual([...proofLines(out),...sendLines(out),...ssoLines(out)],['proof: dropped; --sso drops header x-console-proof','send: carried',
+   `sso: on; drops ${DROPS}; carries --port ${e.port} --business acme --send --tester-port 7333`]);
+  assert.equal(out[out.findIndex((l)=>l.startsWith('sso:'))+1],`Console: scripts/webui-service.sh install --copy ${C1} --copies ${COPIES} ${want.join(' ')}`);
+  r=await prun(e,'activate',C1,'acme','--sso');assert.equal(r.code,0,r.out+r.err);
+  assert.equal(pointer(e).copy,C1);assert.deepEqual(pointer(e).console,want);
+  assert.ok(conExec(e).endsWith(` --checkout ${repo} ${want.join(' ')}`),conExec(e));
+  r=await prun(e,'status','acme');assert.equal(r.code,0,r.err);assert.match(r.out,/unit flags: match the pointer/);
+  const steps=stepText(e);
+  assert.ok(steps.includes(`Z drop --proof-header x-console-proof --proof-file ${f}; --sso was given\n`),steps);
+  assert.ok(steps.includes(`Z turn on --sso; drop ${DROPS}\n`),steps);
+  await noLeak(e);
+ });
+ await t.test('item 1: --sso may re-pin the live copy once; later activates carry it; --no-send still drops --send',async(t)=>{
+  const e=await mk(t),base=await seedPreview(e,undefined,['--send']);await ssoConfig(e);
+  let r=await prun(e,'activate',C1,'acme');assert.equal(r.code,0,r.out+r.err);
+  let out=await planOnly(e,0,'activate',C1,'acme','--sso');
+  assert.deepEqual([...proofLines(out),...ssoLines(out)],['proof: off',`sso: on; drops ${DROPS}; carries --port ${e.port} --business acme --send`]);
+  r=await prun(e,'activate',C1,'acme','--sso');assert.equal(r.code,0,r.out+r.err);
+  const l=logLines(e).at(-1);assert.deepEqual([l.op,l.from,l.to,l.result],['activate',C1,C1,'ok']);
+  assert.deepEqual(pointer(e).console,['--port',e.port,'--business','acme','--sso','--send']);
+  assert.doesNotMatch(stepText(e),/proof/);
+  await refused(e,['activate',C1,'acme','--sso'],'already-active',`${C1} is the pointer's copy`);
+  await refused(e,['activate',C1,'acme'],'already-active',`${C1} is the pointer's copy`);
+  out=await planOnly(e,0,'activate',C,'acme');assert.deepEqual(ssoLines(out),['sso: carried']);
+  r=await prun(e,'activate',C,'acme','--migrate');assert.equal(r.code,0,r.out+r.err);
+  // Carried, not turned on: no stamped step names sso (the install output's serve line still shows --sso).
+  assert.deepEqual(pointer(e).console,['--port',e.port,'--business','acme','--sso','--send']);assert.doesNotMatch(stepText(e),/^\S+Z .*sso/m);
+  assert.match(stepText(e),/^serve: .* --sso --send$/m);
+  r=await prun(e,'activate',C,'acme','--no-send');assert.equal(r.code,0,r.out+r.err);
+  assert.deepEqual(pointer(e).console,['--port',e.port,'--business','acme','--sso']);
+  r=await prun(e,'status','acme');assert.equal(r.code,0,r.err);assert.match(r.out,/unit flags: match the pointer/);
+  const g=await mk(t);await seedPreview(g,undefined,['--send']);await ssoConfig(g);
+  r=await prun(g,'activate',C1,'acme','--sso','--no-send');assert.equal(r.code,0,r.out+r.err);
+  assert.deepEqual(pointer(g).console,['--port',g.port,'--business','acme','--sso']);
+  assert.ok(stepText(g).includes('Z drop --send; --no-send was given\n'));
+  for(const x of [e,g])await noLeak(x);
+ });
+ await t.test('item 1: --sso with a pair or --no-proof, or on any verb but activate, is a usage error',async(t)=>{
+  const e=await mk(t);await seedPreview(e);const f=await proofFile(e);
+  const usageText=(await prun(e,'--help')).err,n=calls(e).length,logs=logLines(e).length,before=fp(e);
+  for(const args of [['activate',C1,'acme','--sso',...pair(f)],['activate',C1,'acme','--sso','--no-proof'],['activate',C1,'acme','--no-proof','--sso','--plan'],
+   ['rollback','acme','--sso'],['pm-on','acme','--sso'],['status','acme','--sso'],['adopt','acme','--sso']]){
+   const r=await prun(e,...args);assert.equal(r.code,4,args.join(' '));assert.equal(r.out,'');assert.equal(r.err,usageText);
+  }
+  assert.match(usageText,/\[--proof-header NAME --proof-file PATH \| --no-proof \| --sso\] \[--no-send\]/);
+  assert.deepEqual(fp(e),before);assert.deepEqual(startsStops(e,n),[]);assert.equal(logLines(e).length,logs);
+  await noLeak(e);
+ });
+ await t.test('item 2: a target without --sso, a missing or bad console.sso, and each slot problem refuse before any stop',async(t)=>{
+  const e=await mk(t);await seedPreview(e);await ssoConfig(e,{slot:false});
+  const slot=slotPath(e),put=(mode=0o600,text='x\n')=>{rmSync(slot,{force:true,recursive:true});writeFileSync(slot,text,{mode});chmodSync(slot,mode)};
+  put();
+  await refused(e,['activate',B,'acme','--sso'],'sso-target',`${B}'s Console does not support --sso`);
+  setKey(e,undefined);
+  // N4: from another copy, the refusal names the re-pin without --sso as the first step.
+  await refused(e,['activate',C1,'acme','--sso'],'sso-config',`${C1}'s Console would refuse its --sso start: there is no console.sso in the system config; activate ${C1} without --sso first, then write console.sso, then run activate ${C1} --sso`);
+  let r=await prun(e,'activate',C1,'acme');assert.equal(r.code,0,r.out+r.err);
+  await refused(e,['activate',C1,'acme','--sso'],'sso-config',`${C1}'s Console would refuse its --sso start: there is no console.sso in the system config`);
+  setKey(e,{sso:{...SSO_KEY.sso,providers:[{...SSO_KEY.sso.providers[0],algs:['RS256']}]}});
+  r=await prun(e,'activate',C1,'acme','--sso','--plan');assert.equal(r.code,0,r.out+r.err);
+  await refused(e,['activate',C,'acme','--sso'],'sso-config',`${C}'s Console would refuse its --sso start: console.sso.providers[0].algs[0] must be one of ${ALGS.filter((a)=>a!=='RS256').join(', ')}; HS* and none are refused`);
+  setKey(e,SSO_KEY);
+  const bad=(why)=>`console.sso provider a client secret slot ${slot} ${why}`;
+  rmSync(slot);
+  await refused(e,['activate',C,'acme','--sso'],'sso-slot',bad('is missing'));
+  const elsewhere=join(e.root,'elsewhere');writeFileSync(elsewhere,'x\n',{mode:0o600});symlinkSync(elsewhere,slot);
+  await refused(e,['activate',C,'acme','--sso'],'sso-slot',bad('is a symbolic link'));
+  rmSync(slot);mkdirSync(slot,{mode:0o700});
+  await refused(e,['activate',C,'acme','--sso'],'sso-slot',bad('is not a regular file'));
+  for(const mode of [0o644,0o640,0o604]){put(mode);await refused(e,['activate',C,'acme','--sso'],'sso-slot',bad(`has mode ${mode.toString(8)}, which gives group or other permission bits`))}
+  put(0o600,'');
+  await refused(e,['activate',C,'acme','--sso'],'sso-slot',bad('is empty'));
+  // The slot directory resolving into the repository: the file is no link, but its real path is.
+  const inRepo=mkdtempSync(join(repo,'t56-slot-'));t.after(()=>rmSync(inRepo,{recursive:true,force:true}));
+  writeFileSync(join(inRepo,SLOT),'x\n',{mode:0o600});chmodSync(join(inRepo,SLOT),0o600);
+  const secrets=dirname(slot);rmSync(secrets,{recursive:true});symlinkSync(inRepo,secrets);
+  await refused(e,['activate',C,'acme','--sso'],'sso-slot',bad('is inside the repository or the copies'));
+  // --plan lists the sso refusal with the rest and writes nothing.
+  const out=await planOnly(e,3,'activate',C,'acme','--sso','--tester-port','80');
+  assert.deepEqual(out.filter((l)=>l.startsWith('refuses ')),[`refuses tester-port-invalid: --tester-port 80 is not a whole port from 1024 to 65535 other than 7332 and the Console's --port ${e.port}`,`refuses sso-slot: ${bad('is inside the repository or the copies')}`]);
+  rmSync(secrets);mkdirSync(secrets,{mode:0o700});put();
+  r=await prun(e,'activate',C,'acme','--sso','--migrate');assert.equal(r.code,0,r.out+r.err);
+  await noLeak(e);
+ });
+ await t.test('item 3: a config whose console key the target loader refuses stops an activate or a rollback before any stop, naming the first step',async(t)=>{
+  const e=await mk(t);await seedPreview(e);await ssoConfig(e);
+  let r=await prun(e,'activate',C1,'acme');assert.equal(r.code,0,r.out+r.err);
+  const why='mosaic-config: unsupported configuration key: "console"';
+  await refused(e,['activate',B,'acme'],'config-console-key',KEY_MSG(e,B,'activate',why));
+  await refused(e,['rollback','acme'],'config-console-key',KEY_MSG(e,B,'rollback',why));
+  const out=await planOnly(e,3,'rollback','acme');
+  assert.deepEqual(out.filter((l)=>l.startsWith('refuses ')),[`refuses config-console-key: ${KEY_MSG(e,B,'rollback',why)}`]);
+  setKey(e,{sso:{...SSO_KEY.sso,providers:[{...SSO_KEY.sso.providers[0],algs:['RS256']}]}});
+  await refused(e,['activate',C,'acme'],'config-console-key',KEY_MSG(e,C,'activate',`mosaic-config: console.sso.providers[0].algs[0] must be one of ${ALGS.filter((a)=>a!=='RS256').join(', ')}; HS* and none are refused`));
+  setKey(e,undefined);
+  r=await prun(e,'rollback','acme');assert.equal(r.code,0,r.out+r.err);assert.equal(pointer(e).copy,B);
+  await noLeak(e);
+ });
+ await t.test('item 3: a rollback from --sso to a Console without it takes the flags from the set of the activation onto the copy, past a same-copy re-pin (sage-1389)',async(t)=>{
+  const e=await mk(t),base=await seedPreview(e,undefined,['--send','--tester-port','7333']);await ssoConfig(e);
+  let r=await prun(e,'activate',C1,'acme');assert.equal(r.code,0,r.out+r.err);
+  const set=arrivalSet(e,C1);
+  r=await prun(e,'activate',C1,'acme','--sso');assert.equal(r.code,0,r.out+r.err);
+  r=await prun(e,'activate',C1,'acme','--no-send');assert.equal(r.code,0,r.out+r.err);
+  // The latest set holds the --sso Console; the arrival set holds B's.
+  assert.match(readFileSync(join(setOf(e,pointer(e).activation),SHOW),'utf8'),/ --sso /);
+  assert.doesNotMatch(readFileSync(join(set,SHOW),'utf8'),/ --sso /);
+  await refused(e,['rollback','acme'],'config-console-key',KEY_MSG(e,B,'rollback','mosaic-config: unsupported configuration key: "console"'));
+  setKey(e,undefined);
+  const want=[...noSend(base.slice(0,-2)),'--tester-port','7333'];
+  const out=await planOnly(e,0,'rollback','acme');
+  assert.deepEqual(ssoLines(out),[ROLLBACK_PLAN(set)]);
+  assert.equal(out.find((l)=>l.startsWith('Console: ')),`Console: scripts/webui-service.sh install --copy ${B} --copies ${COPIES} ${want.join(' ')}`);
+  r=await prun(e,'rollback','acme');assert.equal(r.code,0,r.out+r.err);
+  assert.equal(pointer(e).copy,B);assert.deepEqual(pointer(e).console,want);
+  assert.ok(conExec(e).endsWith(` --checkout ${repo} ${want.join(' ')}`),conExec(e));
+  assert.ok(stepText(e).includes(`Z drop --sso; ${B}'s Console does not support it, so the Console flags come from ${set}/${SHOW}\n`));
+  r=await prun(e,'status','acme');assert.equal(r.code,0,r.err);assert.match(r.out,/unit flags: match the pointer/);
+  // The plain case: --send and the preview set and pair come back as they were.
+  const g=await mk(t),gbase=await seedPreview(g,undefined,['--send']),f=await proofFile(g);
+  r=await prun(g,'activate',B,'acme',...pair(f));assert.equal(r.code,0,r.out+r.err);
+  await ssoConfig(g);
+  r=await prun(g,'activate',C1,'acme','--sso');assert.equal(r.code,0,r.out+r.err);
+  setKey(g,undefined);
+  r=await prun(g,'rollback','acme');assert.equal(r.code,0,r.out+r.err);
+  assert.deepEqual(pointer(g).console,[...noSend(gbase),...pair(f),'--send']);
+  for(const x of [e,g])await noLeak(x);
+ });
+ await t.test('item 3: a rollback set that is missing, fails its sums, holds no argv or already ran --sso refuses sso-rollback-flags',async(t)=>{
+  const e=await mk(t);await seedPreview(e);await ssoConfig(e);
+  let r=await prun(e,'activate',C1,'acme','--sso');assert.equal(r.code,0,r.out+r.err);
+  setKey(e,undefined);
+  const set=arrivalSet(e,C1),show=join(set,SHOW),text=readFileSync(show,'utf8');
+  setEdit(set,SHOW,' --public-host ',' --sso --public-host ');
+  await refused(e,['rollback','acme'],'sso-rollback-flags',RB_MSG(`the Console in ${show} already ran with --sso`));
+  let out=await planOnly(e,3,'rollback','acme');
+  assert.deepEqual(out.filter((l)=>l.startsWith('refuses ')),[`refuses sso-rollback-flags: ${RB_MSG(`the Console in ${show} already ran with --sso`)}`]);
+  setEdit(set,SHOW,' --sso --public-host ',' --public-host ',false);
+  await refused(e,['rollback','acme'],'sso-rollback-flags',RB_MSG(`${show} does not match the set's SHA256SUMS`));
+  setEdit(set,SHOW,' serve ',' ',true);
+  await refused(e,['rollback','acme'],'sso-rollback-flags',RB_MSG(`${show} holds no Console argv this script can read`));
+  rmSync(show);
+  await refused(e,['rollback','acme'],'sso-rollback-flags',RB_MSG(`${set} has no ${SHOW} and SHA256SUMS`));
+  writeFileSync(show,text);setEdit(set,SHOW,'\n','\n',true);
+  // A log whose arrival line came from another copy names no set for B.
+  const log=readFileSync(e.log,'utf8');chmodSync(e.log,0o600);
+  writeFileSync(e.log,log.replaceAll(`"from":"${B}","to":"${C1}"`,`"from":"${A}","to":"${C1}"`));
+  await refused(e,['rollback','acme'],'sso-rollback-flags',RB_MSG(`the log names no activation that moved the stack from ${B} onto ${C1}`));
+  writeFileSync(e.log,readFileSync(e.log,'utf8').replaceAll(`"from":"${A}","to":"${C1}"`,`"from":"${B}","to":"${C1}"`));
+  r=await prun(e,'rollback','acme');assert.equal(r.code,0,r.out+r.err);assert.equal(pointer(e).copy,B);
+  await noLeak(e);
+ });
+ await t.test('round 2 (webby-0028 N1): run through a symlinked repository path, a slot or a proof file inside the repository still refuses',async(t)=>{
+  const link=join(base,'repo-link.200');if(!existsSync(link))symlinkSync(repo,link);
+  const e=await mk(t);e.sr=join(link,'scripts','stack-release.sh');await seedPreview(e);
+  const f=await proofFile(e,'proof.200',0o600,mkdtempSync(join(repo,'t56-proof-')));t.after(()=>rmSync(dirname(f),{recursive:true,force:true}));
+  await refused(e,['activate',C1,'acme',...pair(f)],'proof-file-invalid',`--proof-file ${f} is inside the repository or the copies`);
+  await ssoConfig(e,{slot:false});
+  let r=await prun(e,'activate',C1,'acme');assert.equal(r.code,0,r.out+r.err);
+  const inRepo=mkdtempSync(join(repo,'t56-slot-'));t.after(()=>rmSync(inRepo,{recursive:true,force:true}));
+  writeFileSync(join(inRepo,SLOT),'x\n',{mode:0o600});chmodSync(join(inRepo,SLOT),0o600);
+  const secrets=dirname(slotPath(e));rmSync(secrets,{recursive:true});symlinkSync(inRepo,secrets);
+  await refused(e,['activate',C1,'acme','--sso'],'sso-slot',`console.sso provider a client secret slot ${slotPath(e)} is inside the repository or the copies`);
+  await noLeak(e);
+ });
+ await t.test('round 2 (webby-0028 N2): a config.json that does not parse stops the run before anything is read or stopped',async(t)=>{
+  const e=await mk(t);await seedPreview(e);
+  // load_config exits first, before the pointer, the log or a unit is read; config_checks' own
+  // refusal is the guard for a file that changes after that (BUILD.md, round 2).
+  const good=readFileSync(e.cfg,'utf8');writeFileSync(e.cfg,good.slice(0,-1));
+  const before=fp(e),n=calls(e).length,logs=logLines(e).length;
+  for(const args of [['activate',C1,'acme'],['rollback','acme'],['activate',C1,'acme','--plan']]){
+   const r=await prun(e,...args);assert.equal(r.code,1,args.join(' '));assert.match(r.err,/common: configuration load failed\n$/);
+  }
+  assert.deepEqual(fp(e),before);assert.deepEqual(startsStops(e,n),[]);assert.equal(logLines(e).length,logs);
+  writeFileSync(e.cfg,good);
+  const r=await prun(e,'activate',C1,'acme');assert.equal(r.code,0,r.out+r.err);
+  await noLeak(e);
+ });
+});
+
 // --- rehearse (D2, row 163; the brief's "Stack rehearsal on a scratch root") ---
 // Copies of their own in RCOPIES: the real scripts/mosaic, config loader, business loader, roles and
 // mosaic-config.mjs, with stand-ins for the bus host (cli.mjs), the Console, the Store and
@@ -129,6 +129,45 @@ Switching the Console, bus or wrapper, changing any unit, and starting or
 stopping either service requires Mos's go for that live step. Agents build
 and test fixtures; they stop before the live sequence.

+## Sign-in in the Console (Q175 phase 1, #1690)
+
+`serve --sso [--send] [--tester-port N]` makes the Console an OpenID Connect
+relying party. It reads `console.sso` from the system config (`publicOrigin`
+and one or more providers, each with its issuer, client id, a client secret
+slot, the signing algorithms it accepts and the subjects allowed in). The
+design is `agents/sage/work/q175-sso/DESIGN.md`. `--sso` can't be combined
+with `--public-host`, `--auth-header`, `--allow-user` or `--proof-*`; `--send`
+takes `--sso` in place of the preview set.
+
+- The client secret is read once at start from
+  `<config dir>/secrets/mosaic-stack/<slot>`. The start refuses a slot that is
+  a symbolic link, not a regular file, owned by another user, has any group or
+  other mode bit, or sits in the repository, the `--checkout` directory or a
+  stack copy. The value is never printed.
+- At start the Console fetches each provider's discovery document and JWKS. A
+  provider that can't be reached (a network error, a timeout, a status other
+  than 200, or a body that isn't JSON) leaves the Console up with that
+  provider's `/auth/login` at 503 and a retry every 5 s, doubling, capped at 5
+  minutes. A document that fails a check (issuer, algorithms, S256, a usable
+  key) refuses the start. `/healthz` adds `sso: { <id>: "ready" | "unreachable"
+  | "refused" }`.
+- The Console listener serves only the Host of `publicOrigin`, whatever port
+  it listens on. Any other Host, a loopback one included, gets 403 `public
+  Host required`, except `GET /healthz`, which stays open on loopback for the
+  status and release gates. The loopback operator path in the preview section
+  above does not exist under `--sso`.
+- Without a session, `/api/*` gets 401 `sign-in required` and a page load gets
+  a 303 to `/auth/login?return=<path>`. The page then shows the signed-out line
+  with a link back to sign-in. A session lasts at most 8 hours and ends after 1
+  hour without a page load or a write; a restart ends every session.
+- The page shows Sign out only under `--sso`. It posts to `/auth/logout`, which
+  ends the session and goes to the provider's end-session endpoint when it has
+  one, or to `/auth/signed-out`.
+- With `--tester-port`, the tester listener refuses any request carrying an
+  `Authorization` header, a `__Host-mosaic_session` or `__Host-mosaic_login`
+  cookie, or an `x-authentik-*` header (403 `tester listener takes no
+  sign-in`). It never serves `/auth/*`.
+
 ## Message a role (row 76, #1570)

 ```sh
@@ -58,8 +58,9 @@ export async function chatHTTP(req, res, { path, search, chat, named, send, prev
      if (one(req, 'origin') !== preview.origin) return refuse(403, 'cross-origin');
    } else {
      if (!send || !named || !preview) return refuse(403, 'read-only');
-      if (one(req, preview.header) !== preview.user) return refuse(401, 'unauthenticated');
-      if (one(req, 'origin') !== `https://${preview.host}`) return refuse(403, 'cross-origin');
+      // Q175 phase 1 (#1690): under --sso the session was checked before this route.
+      if (preview.sso !== true && one(req, preview.header) !== preview.user) return refuse(401, 'unauthenticated');
+      if (one(req, 'origin') !== (preview.origin ?? `https://${preview.host}`)) return refuse(403, 'cross-origin');
    }
    if (one(req, 'sec-fetch-site') !== 'same-origin') return refuse(403, 'cross-site');
  }
@@ -7,20 +7,23 @@ import { views } from '../../bus/src/views.mjs';
 import { loadSystem, socketPath, REPO, rolesDir } from '../../cli/src/config.mjs';
 import { configDir } from '../../business/src/business.mjs';
 import { consoleReads, redactor } from './reads.mjs';
+import { createSso, readSlot } from './sso.mjs';
 import { statSync } from 'node:fs';
 import { isAbsolute } from 'node:path';
 import { ID_PATTERN } from '../../business/src/vocabulary.mjs';
 const args = process.argv.slice(2);
-const usage = 'node packages/webui/src/cli.mjs serve [--port N] [--tester-port N] [--checkout PATH] [--board http://127.0.0.1:7331] [--business ID] [--public-host NAME --auth-header HEADER --allow-user ID [--send] [--proof-header NAME --proof-file PATH]]';
+const usage = 'node packages/webui/src/cli.mjs serve [--port N] [--tester-port N] [--checkout PATH] [--board http://127.0.0.1:7331] [--business ID] [--sso [--send]] [--public-host NAME --auth-header HEADER --allow-user ID [--send] [--proof-header NAME --proof-file PATH]]';
 try {
  if (args.length === 1 && ['--help', '-h'].includes(args[0])) { console.log(usage); process.exit(0); }
  if (args.shift() !== 'serve') throw new Error(usage);
  const options = { board: DEFAULT_BOARD, port: 7330 }, preview = {}, proofFlags = {};
-  let sendOn = false, testerPort = null;
+  let sendOn = false, ssoOn = false, testerPort = null;
  while (args.length) {
    const flag = args.shift();
    // Row 76 (#1570): the one flag without a value.
    if (flag === '--send') { sendOn = true; continue; }
+    // Q175 phase 1 (#1690): the Console signs people in itself, from console.sso in config.json.
+    if (flag === '--sso') { ssoOn = true; continue; }
    const value = args.shift();
    if (!value) throw new Error(`missing value for ${flag}`);
    if (flag === '--port') {
@@ -51,9 +54,10 @@ try {
    else throw new Error(`unknown option: ${flag}`);
  }
  if (testerPort !== null && (testerPort === options.port || testerPort === 7332)) throw new Error('--tester-port must differ from --port and cannot be the forwarded port 7332');
+  if (ssoOn && (Object.keys(preview).length || Object.keys(proofFlags).length)) throw new Error('--sso cannot be combined with --public-host, --auth-header, --allow-user or --proof-*');
  options.preview = previewOptions(preview);
  const proof = proofOptions(proofFlags, options.preview);
-  if (sendOn && !options.preview) throw new Error('--send needs the preview mode (--public-host, --auth-header and --allow-user)');
+  if (sendOn && !options.preview && !ssoOn) throw new Error('--send needs the preview mode (--public-host, --auth-header and --allow-user) or --sso');
  // The bus views (slice 1 S5) need the system config. Without it the
  // board still serves and the bus routes answer not-configured.
  // The Queue, Business and Settings reads (row 54) need no bus; without
@@ -77,31 +81,46 @@ try {
    busLine = `Bus: ${options.business ?? 'the running bus host\'s business'}`;
  } catch (err) {
    const why = redactor({ configDir: configDir() })(err.message);
+    if (ssoOn) throw new Error(`--sso needs the system config (${why})`);
    if (sendOn) throw new Error(`--send needs the bus configured (${why})`);
    if (testerPort !== null) throw new Error(`--tester-port needs the bus configured (${why})`);
    busLine = `Bus: not configured (${why})`;
  }
  const reads = consoleReads({ root: REPO, queueRoot: options.checkout ?? REPO, system, configDir: configDir(), rolesDir: rolesDir(), business: options.business ?? null });
-  const server = await startServer({ board: options.board, port: options.port, bus, reads, preview: options.preview, proof, send, settingsWrite, projectFiles, projectFile, projectSave, chat, nameWrite, assistantStop, instancesWrite, routesWrite });
+  // The sign-in config is checked again here, then each slot file, before anything listens. A
+  // provider that can't be reached starts degraded; one whose discovery is refused stops the start.
+  let sso = null;
+  if (ssoOn) {
+    if (!system.console?.sso) throw new Error('--sso needs console.sso in the system config');
+    const secrets = new Map(system.console.sso.providers.map(p => [p.id, readSlot(configDir(), p, { repo: REPO, checkout: options.checkout ?? null })]));
+    sso = await createSso(system.console.sso, { secrets });
+  }
+  let server;
+  try {
+    server = await startServer({ board: options.board, port: options.port, bus, reads, preview: options.preview, sso, proof, send, settingsWrite, projectFiles, projectFile, projectSave, chat, nameWrite, assistantStop, instancesWrite, routesWrite });
+  } catch (err) { sso?.close(); throw err; }
  let testerServer = null;
  if (testerPort !== null) {
    const call = busCaller({ dataRoot: system.dataRoot, socket: socketPath(system.dataRoot), business: options.business ?? null, cli: TESTER_CLI });
    const testerBus = { ...views({ call }), names: () => call('names'), instances: () => call('instances'), routes: () => call('routes') };
    try {
      testerServer = await startServer({ host: '127.0.0.1', port: testerPort, board: options.board,
-        tester: true, testerProofHeader: proof?.header ?? null, testerAuthHeader: options.preview?.header ?? null, bus: testerBus, reads,
+        tester: true, testerNoSignIn: ssoOn, testerProofHeader: proof?.header ?? null, testerAuthHeader: options.preview?.header ?? null, bus: testerBus, reads,
        projectFiles: args => call('project.files', args), projectFile: args => call('project.file', args),
        instancesWrite: args => call('instances.set', args), routesWrite: args => call('routes.set', args), nameWrite: args => call('name.set', args),
        // Row 177 (#1675): the tester's own chat, through the tester CLI; 7332's stays the human's.
        chat: createChat({ call }),
      });
-    } catch (err) { await new Promise(resolve => server.close(resolve)); throw err; }
+    } catch (err) { sso?.close(); await new Promise(resolve => server.close(resolve)); throw err; }
  }
  const previewLine = options.preview ? `\nPreview: https://${options.preview.host}/ through the proxy, signed-in user from ${options.preview.header}, ${send ? 'reads and human messages to roles (--send); one line per send below' : 'read-only'}` : '';
  const proofLine = `\nProxy: proxy proof ${proof ? 'on' : 'off'}`;
+  // One line per provider: id, issuer, subject count and state. No client id, secret or sub.
+  const health = sso?.health() ?? {};
+  const ssoLines = sso ? `\nSign-in: ${sso.publicOrigin}/ (--sso), ${send ? 'reads and human writes (--send)' : 'read-only'}` + sso.summary().map(p => `\nSign-in provider: ${p.id} issuer ${p.issuer} subjects ${p.subjects} (${health[p.id]})`).join('') : '';
  const queueLine = options.checkout ? '\nQueue: read from the --checkout directory' : '';
-  console.log(`Mosaic Console: http://127.0.0.1:${server.address().port}/\nBoard: ${options.board}\n${busLine}${queueLine}${previewLine}${proofLine}${testerServer ? `\nTester Console: http://127.0.0.1:${testerServer.address().port}/ (binds the tester)` : ''}\nCtrl-C stops this server.`);
-  for (const signal of ['SIGINT', 'SIGTERM']) process.once(signal, () => { server.close(); testerServer?.close(); });
+  console.log(`Mosaic Console: http://127.0.0.1:${server.address().port}/\nBoard: ${options.board}\n${busLine}${queueLine}${previewLine}${ssoLines}${proofLine}${testerServer ? `\nTester Console: http://127.0.0.1:${testerServer.address().port}/ (binds the tester)` : ''}\nCtrl-C stops this server.`);
+  for (const signal of ['SIGINT', 'SIGTERM']) process.once(signal, () => { sso?.close(); server.close(); testerServer?.close(); });
 } catch (err) {
  console.error(`refused: ${err.message}`);
  process.exitCode = 2;
@@ -16,6 +16,11 @@
  // The first one sets body.signed-out (the listener below); after that no Console fetch is made.
  const out = () => document.body.classList.contains('signed-out');
  const signOut = () => { if (!out()) document.dispatchEvent(new Event('mosaic-signed-out')); };
+  // Q175 phase 1 (#1690): under --sso the Console itself answers a read without a session with 401
+  // `sign-in required`; that signs the page out too, and the line links to the Console's sign-in.
+  // Any other 401 stays an error. `sso` comes from /api/config.
+  let sso = false;
+  const signInRequired = (res, body) => res.status === 401 && body?.error === 'sign-in required';
  const signedOut = () => Object.assign(new Error('the sign-in proxy redirected it, so it never reached the Console'), { signedOut: true });
  const labels = { registration: 'registered', 'first-user-message': 'first message', 'tmux-pane': 'tmux pane', 'session-cwd': 'session cwd', 'workspace-git-root': 'git root' };
  const source = value => value ? `<span class="source">${esc(labels[value] || value)}</span>` : '';
@@ -110,6 +115,7 @@
    const res = await fetch(path, { cache: 'no-store', redirect: 'manual' });
    if (res.type === 'opaqueredirect') { signOut(); throw signedOut(); }
    let body; try { body = await res.json(); } catch { body = { error: `HTTP ${res.status}` }; }
+    if (signInRequired(res, body)) { sso = true; signOut(); throw signedOut(); }
    return { ok: res.ok, body };
  }
  function blockNode(b) {
@@ -304,6 +310,7 @@
    const res = await fetch(path, value === undefined ? { cache: 'no-store', redirect: 'manual' } : { method: 'POST', headers: { 'content-type': 'application/json' }, body: JSON.stringify(value), redirect: 'manual' });
    if (res.type === 'opaqueredirect') { signOut(); throw signedOut(); }
    const result = await res.json();
+    if (signInRequired(res, result)) { sso = true; signOut(); throw signedOut(); }
    if (!res.ok) throw Object.assign(new Error(result.error || `HTTP ${res.status}`), { status: res.status });
    return result;
  }
@@ -452,7 +459,7 @@
  });
  // Signed out: everything drawn from a Console read goes, because none of it can be refreshed. The
  // line says so once; the send form (bus.js) keeps its draft and receipt. Reload is the way back.
-  document.addEventListener('mosaic-signed-out', () => {
+  document.addEventListener('mosaic-signed-out', e => {
    if (out()) return;
    document.body.classList.add('signed-out');
    clearTimeout(timer); convGen++;
@@ -461,9 +468,13 @@
    for (const id of ['projects', 'waiting', 'seen', 'sessions']) $(id).replaceChildren();
    $('refresh').disabled = $('pause').disabled = true;
    const line = $('signed-out');
-    line.innerHTML = '<p><b>Signed out.</b> Reload the page to sign in.</p>'; line.hidden = false;
+    line.innerHTML = sso || e.detail?.signIn
+      ? `<p><b>Signed out.</b> <a href="/auth/login?${esc(new URLSearchParams({ return: location.pathname + location.search }))}">Sign in again</a>.</p>`
+      : '<p><b>Signed out.</b> Reload the page to sign in.</p>';
+    line.hidden = false; $('sign-out').hidden = true;
    // Focus moves to the line only if what had it is gone or disabled, never out of a form being typed in.
    setTimeout(() => { const a = document.activeElement; if (!a || a === document.body || a.disabled || !a.getClientRects().length) line.focus(); });
  });
-  api('/api/config').then(config => { board = config.board; $('board-url').textContent = `Board: ${board}`; }).catch(err => { if (machine) error(err); }).finally(refresh);
+  // Sign out (sage-1347, F7): a plain same-origin form POST to /auth/logout, shown only under --sso.
+  api('/api/config').then(config => { board = config.board; $('board-url').textContent = `Board: ${board}`; if (config.sso === true) { sso = true; $('sign-out').hidden = out(); } }).catch(err => { if (machine) error(err); }).finally(refresh);
 })();
@@ -30,6 +30,10 @@
  const out = () => document.body.classList.contains('signed-out');
  const signOut = () => { if (!out()) document.dispatchEvent(new Event('mosaic-signed-out')); };
  const signedOut = () => new ReadError('signed-out', 'The sign-in proxy redirected the read.', 0);
+  // Q175 phase 1 (#1690, sage-1340 F1): under --sso a read without a session gets 401 `sign-in
+  // required` from the Console itself. That signs out the same way; any other 401 stays an error.
+  const signInRequired = (res, body) => res.status === 401 && body?.error === 'sign-in required';
+  const signOutSso = () => { if (!out()) document.dispatchEvent(new CustomEvent('mosaic-signed-out', { detail: { signIn: true } })); };
  // `replies` takes a message id as `id`; trail takes `subject`.
  async function fetchRead(verb, subject) {
    if (out()) throw signedOut();
@@ -38,6 +42,7 @@
    catch { throw new ReadError('unreachable', 'The Console server did not answer.', 0); }
    if (res.type === 'opaqueredirect') { signOut(); throw signedOut(); }
    try { body = await res.json(); } catch { throw new ReadError('unreachable', 'The Console server did not answer.', 0); }
+    if (signInRequired(res, body)) { signOutSso(); throw signedOut(); }
    if (!res.ok || !body || !Array.isArray(body.rows)) throw new ReadError(typeof body?.error === 'string' ? body.error : 'invalid-response', typeof body?.message === 'string' ? body.message : `HTTP ${res.status}`, res.status);
    return { ...body, rows: body.rows, at: body.at };
  }
@@ -50,6 +55,7 @@
    try { res = await fetch(`/api/${path}`, { cache: 'no-store', redirect: 'manual' }); } catch { throw unreachable(); }
    if (res.type === 'opaqueredirect') { signOut(); throw signedOut(); }
    try { body = await res.json(); } catch { throw unreachable(); }
+    if (signInRequired(res, body)) { signOutSso(); throw signedOut(); }
    if (!res.ok || !body || typeof body !== 'object' || Array.isArray(body)) throw Object.assign(new ReadError(typeof body?.error === 'string' ? body.error : 'invalid-response', typeof body?.message === 'string' ? body.message : `HTTP ${res.status}`, res.status), { module: true });
    return body;
  }
@@ -9,7 +9,7 @@
 <header class="cmdbar"><a href="/" class="wordmark"><svg class="mark" viewBox="0 0 16 17" aria-hidden="true"><use href="/icons.svg#mark"/></svg>Mosaic<small>Console</small></a>
 <button type="button" class="cmdk" id="cmdk" aria-haspopup="dialog" aria-controls="cmdk-dialog"><svg class="i" aria-hidden="true"><use href="/icons.svg#i-search"/></svg><span>Go to a view, decision or task</span><kbd>Ctrl K</kbd></button>
 <p class="fresh" id="fresh"><span id="fresh-board"></span><span id="fresh-bus"></span></p>
-<div class="cmd-right"><label>Palette<select id="palette"></select></label><label>Appearance<select id="mode"><option value="system">system</option><option value="light">light</option><option value="dim">dim</option><option value="dark">dark</option></select></label><button class="btn" id="refresh" type="button">Refresh</button><button class="btn" id="pause" type="button" aria-pressed="false">Pause</button></div></header>
+<div class="cmd-right"><label>Palette<select id="palette"></select></label><label>Appearance<select id="mode"><option value="system">system</option><option value="light">light</option><option value="dim">dim</option><option value="dark">dark</option></select></label><button class="btn" id="refresh" type="button">Refresh</button><button class="btn" id="pause" type="button" aria-pressed="false">Pause</button><form id="sign-out" method="post" action="/auth/logout" hidden><button class="btn" type="submit">Sign out</button></form></div></header>
 <div class="frame">
 <nav class="tree" aria-label="Console"><h2 class="tree-title">Console</h2><ul class="s1-sections" id="sections"></ul><div id="board-tree"><h2 class="tree-title">Projects</h2><div id="projects"><p class="muted">Loading projects…</p></div><p class="small muted">Select a project to filter sessions. Waiting on you always shows all projects.</p></div></nav>
 <main id="main" class="content" tabindex="-1"><div id="signed-out" class="banner ref" role="alert" tabindex="-1" hidden></div><div id="bus-down" class="banner err" role="alert" hidden></div><div class="page-head" id="board-head"><div><h1>Control board</h1><p id="status" class="small muted" role="status">Loading board…</p></div><div class="filters"><label><input id="show-machine" type="checkbox">Show machine sessions</label></div></div>
@@ -61,6 +61,8 @@ async function body(req, max = 4096) {
 // Row 65 (mos-0840) adds `routes`: each instance's harness, model, thinking and fallback.
 const BUS_VERBS = ['inbox', 'tasks', 'agents', 'trail', 'decisions', 'credentials', 'replies', 'messages', 'usage', 'limits', 'names', 'instances', 'routes'];
 const DECISION_LISTS = ['roles', 'recent'];
+// Q175 phase 1 (#1690, F8): either sign-in cookie, which the tester listener refuses under --sso.
+const SIGN_IN_COOKIE = /(?:^|;)\s*__host-mosaic_(?:session|login)\s*=/i;
 // Row 177 (#1675): the chat writes the tester listener lets through, exactly the four chatHTTP routes.
 const TESTER_CHAT_WRITE = /^\/api\/chat\/(?:projects|threads|threads\/[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}\/(?:messages|open))$/i;
 async function busRead(res, bus, verb, search) {
@@ -160,14 +162,18 @@ async function busRead(res, bus, verb, search) {
 // broker's to refuse. Nothing retries; an outcome the bus can't confirm is reported as unknown.
 const SEND_KEYS = ['to', 'body', 'in_reply_to'];
 const one = (req, name) => (req.headersDistinct[name]?.length === 1 ? req.headersDistinct[name][0] : null);
+// Q175 phase 1 (#1690): under --sso the writer comes from a session the handler already checked,
+// so it carries `sso: true` and the public origin; the preview writer still checks its header.
+const signedIn = (req, p) => p.sso === true || one(req, p.header) === p.user;
+const ownOrigin = p => p.origin ?? `https://${p.host}`;
 async function busSend(req, res, { send, preview, log }) {
-  if (one(req, preview.header) !== preview.user) return json(res, 401, { error: 'sign-in required' });
+  if (!signedIn(req, preview)) return json(res, 401, { error: 'sign-in required' });
  let to = null;
  // `to` is quoted and cut short so a crafted value can't forge a log line.
  const line = outcome => log(`${new Date().toISOString()} send user=${JSON.stringify(preview.user)} to=${typeof to === 'string' ? JSON.stringify(to.slice(0, 64)) : 'none'} ${outcome}`);
  // `sent` tells the page which it was: false, nothing was written; 'unknown', it may have been.
  const refuse = (status, error, message, sent = false) => { line(`error=${error}`); return json(res, status, { error, message, sent }); };
-  if (one(req, 'origin') !== `https://${preview.host}`) return refuse(403, 'cross-origin request refused', 'a send needs the Console\'s own Origin');
+  if (one(req, 'origin') !== ownOrigin(preview)) return refuse(403, 'cross-origin request refused', 'a send needs the Console\'s own Origin');
  if (one(req, 'sec-fetch-site') !== 'same-origin') return refuse(403, 'cross-site request refused', 'a send needs Sec-Fetch-Site: same-origin');
  let value;
  try { value = JSON.parse((await body(req, 16384)).toString('utf8')); } catch (err) { return refuse(400, 'invalid-request', err.message); }
@@ -241,10 +247,10 @@ export function proofOptions({ proofHeader, proofFile } = {}, preview = null) {
 // REQ-WEB-1: same signed-in send boundary, a distinct strict settings payload.
 async function settingsSend(req, res, { settingsWrite, preview, log }) {
  const refuse = (status, error, message) => json(res, status, { error, message, sent: false });
-  if (one(req, preview.header) !== preview.user) {
+  if (!signedIn(req, preview)) {
    return refuse(401, 'sign-in required', 'sign in again');
  }
-  if (one(req, 'origin') !== `https://${preview.host}`) {
+  if (one(req, 'origin') !== ownOrigin(preview)) {
    return refuse(403, 'cross-origin request refused', 'settings need the Console origin');
  }
  if (one(req, 'sec-fetch-site') !== 'same-origin') {
@@ -292,8 +298,8 @@ async function seatSend(req, res, { route, write, preview, log }) {
  // The instance is quoted and cut short so a crafted value can't forge a log line.
  const line = outcome => log(`${new Date().toISOString()} ${route.kind} user=${JSON.stringify(preview.user)} instance=${quoted(instance)} ${outcome}`);
  const refuse = (status, error, message, sent = false) => { line(`error=${error}`); return json(res, status, { error, message, sent }); };
-  if (!preview.tester && one(req, preview.header) !== preview.user) return json(res, 401, { error: 'sign-in required', message: 'sign in again', sent: false });
-  if (one(req, 'origin') !== (preview.origin ?? `https://${preview.host}`)) return refuse(403, 'cross-origin request refused', 'this needs the Console\'s own Origin');
+  if (!preview.tester && !signedIn(req, preview)) return json(res, 401, { error: 'sign-in required', message: 'sign in again', sent: false });
+  if (one(req, 'origin') !== ownOrigin(preview)) return refuse(403, 'cross-origin request refused', 'this needs the Console\'s own Origin');
  if (one(req, 'sec-fetch-site') !== 'same-origin') return refuse(403, 'cross-site request refused', 'this needs same-origin Fetch Metadata');
  let value;
  try { value = JSON.parse((await body(req)).toString('utf8')); } catch (err) { return refuse(400, 'invalid-request', err.message); }
@@ -335,8 +341,8 @@ async function instanceSend(req, res, { instancesWrite, preview, log }) {
  // The instance is quoted and cut short so a crafted value can't forge a log line. Vars are never logged.
  const line = outcome => log(`${new Date().toISOString()} instance user=${JSON.stringify(preview.user)} instance=${quoted(instance)} ${outcome}`);
  const refuse = (status, error, message, sent = false) => { line(`error=${error}`); return json(res, status, { error, message, sent }); };
-  if (!preview.tester && one(req, preview.header) !== preview.user) return json(res, 401, { error: 'sign-in required', message: 'sign in again', sent: false });
-  if (one(req, 'origin') !== (preview.origin ?? `https://${preview.host}`)) return refuse(403, 'cross-origin request refused', 'this needs the Console\'s own Origin');
+  if (!preview.tester && !signedIn(req, preview)) return json(res, 401, { error: 'sign-in required', message: 'sign in again', sent: false });
+  if (one(req, 'origin') !== ownOrigin(preview)) return refuse(403, 'cross-origin request refused', 'this needs the Console\'s own Origin');
  if (one(req, 'sec-fetch-site') !== 'same-origin') return refuse(403, 'cross-site request refused', 'this needs same-origin Fetch Metadata');
  let value;
  try { value = JSON.parse((await body(req, 16384)).toString('utf8')); } catch (err) { return refuse(400, 'invalid-request', err.message); }
@@ -382,8 +388,8 @@ async function routesSend(req, res, { routesWrite, preview, log }) {
  let names = [];
  const line = outcome => log(`${new Date().toISOString()} routes user=${JSON.stringify(preview.user)} instances=${quoted(names.join(','))} ${outcome}`);
  const refuse = (status, error, message, sent = false) => { line(`error=${error}`); return json(res, status, { error, message, sent }); };
-  if (!preview.tester && one(req, preview.header) !== preview.user) return json(res, 401, { error: 'sign-in required', message: 'sign in again', sent: false });
-  if (one(req, 'origin') !== (preview.origin ?? `https://${preview.host}`)) return refuse(403, 'cross-origin request refused', 'this needs the Console\'s own Origin');
+  if (!preview.tester && !signedIn(req, preview)) return json(res, 401, { error: 'sign-in required', message: 'sign in again', sent: false });
+  if (one(req, 'origin') !== ownOrigin(preview)) return refuse(403, 'cross-origin request refused', 'this needs the Console\'s own Origin');
  if (one(req, 'sec-fetch-site') !== 'same-origin') return refuse(403, 'cross-site request refused', 'this needs same-origin Fetch Metadata');
  let value;
  try { value = JSON.parse((await body(req, 16384)).toString('utf8')); } catch (err) { return refuse(400, 'invalid-request', err.message); }
@@ -420,8 +426,8 @@ async function projectFileSend(req, res, { projectSave, preview, log }) {
  const line = outcome => log(`${new Date().toISOString()} project-file user=${JSON.stringify(preview.user)} project=${quoted(target?.project)} path=${quoted(target?.path)} ${outcome}`);
  // `sent` tells the page which it was: false, nothing was written; 'unknown', it may have been.
  const refuse = (status, error, message, sent = false) => { line(`error=${error}`); return json(res, status, { error, message, sent }); };
-  if (one(req, preview.header) !== preview.user) return json(res, 401, { error: 'sign-in required', message: 'sign in again', sent: false });
-  if (one(req, 'origin') !== `https://${preview.host}`) return refuse(403, 'cross-origin request refused', 'a save needs the Console\'s own Origin');
+  if (!signedIn(req, preview)) return json(res, 401, { error: 'sign-in required', message: 'sign in again', sent: false });
+  if (one(req, 'origin') !== ownOrigin(preview)) return refuse(403, 'cross-origin request refused', 'a save needs the Console\'s own Origin');
  if (one(req, 'sec-fetch-site') !== 'same-origin') return refuse(403, 'cross-site request refused', 'a save needs same-origin Fetch Metadata');
  let value;
  try { value = JSON.parse((await body(req, FILE_SAVE_MAX)).toString('utf8')); } catch (err) { return refuse(400, 'invalid-request', err.message); }
@@ -460,13 +466,17 @@ async function projectFileRead(res, read, path, search) {
    return json(res, busStatus(code), { error: code, message: err instanceof BusReadError ? err.message : code });
  }
 }
-// `send` is the bus write (row 76): `args => Promise<{id}>`, only with the preview mode. `log`
+// `send` is the bus write (row 76): `args => Promise<{id}>`, only with the preview mode or `sso`.
+// `sso` is createSso() from sso.mjs (Q175 phase 1): the human listener signs people in itself.
+// `testerNoSignIn` makes the tester listener refuse anything that looks like a sign-in (--sso). `log`
 // takes one line per send attempt that got past sign-in; never the body. `fieldsFile` is for
 // tests; the field table is otherwise the committed packages/tasks/fields.json.
-export async function startServer({ host = '127.0.0.1', port = 7330, board = DEFAULT_BOARD, timeout = 20000, bus = null, reads = null, preview = null, tester = false, testerAuthHeader = null, proof = null, testerProofHeader = null, send = null, settingsWrite = null, projectFiles = null, projectFile = null, projectSave = null, chat = null, nameWrite = null, assistantStop = null, instancesWrite = null, routesWrite = null, log = line => console.log(line), fieldsFile = undefined } = {}) {
+export async function startServer({ host = '127.0.0.1', port = 7330, board = DEFAULT_BOARD, timeout = 20000, bus = null, reads = null, preview = null, sso = null, tester = false, testerNoSignIn = false, testerAuthHeader = null, proof = null, testerProofHeader = null, send = null, settingsWrite = null, projectFiles = null, projectFile = null, projectSave = null, chat = null, nameWrite = null, assistantStop = null, instancesWrite = null, routesWrite = null, log = line => console.log(line), fieldsFile = undefined } = {}) {
  if (!isLoopback(host)) throw new Error('refusing to bind to non-loopback host');
  if (host === 'localhost') host = '127.0.0.1';
  if (tester && preview !== null) throw new Error('tester listener cannot use preview mode');
+  if (tester && sso !== null) throw new Error('tester listener cannot use sso');
+  if (sso !== null && (preview !== null || proof !== null)) throw new Error('--sso cannot be combined with --auth-header, --allow-user or --proof-*');
  if (tester && host !== '127.0.0.1') throw new Error('tester listener must bind 127.0.0.1');
  // Row 177 (#1675): chat is allowed. The tester listener's chat binds the tester, so the bus keeps it on tester threads.
  if (tester && [send, settingsWrite, projectSave, assistantStop].some(value => value !== null)) throw new Error('tester listener permits only instance, route, name and chat writes');
@@ -476,21 +486,26 @@ export async function startServer({ host = '127.0.0.1', port = 7330, board = DEF
    throw new Error('preview mode needs --public-host, --auth-header and --allow-user together');
  }
  if (proof !== null && (preview === null || tester)) throw new Error('proxy proof needs preview mode');
-  if (send !== null && (preview === null || typeof send !== 'function')) throw new Error('--send needs the preview mode (--public-host, --auth-header and --allow-user)');
+  if (send !== null && ((preview === null && sso === null) || typeof send !== 'function')) throw new Error('--send needs the preview mode (--public-host, --auth-header and --allow-user) or --sso');
  const server = createServer(async (req, res) => {
    res.setHeader('x-content-type-options', 'nosniff');
    res.setHeader('referrer-policy', 'no-referrer');
-    res.setHeader('content-security-policy', "default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline'; connect-src 'self'; font-src 'self'; object-src 'none'; base-uri 'none'; frame-ancestors 'none'; form-action 'self'");
+    // Under --sso the Sign out form's POST is redirected to the provider's end-session endpoint, and
+    // browsers apply form-action to that redirect, so those origins (from discovery) are allowed too.
+    res.setHeader('content-security-policy', `default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline'; connect-src 'self'; font-src 'self'; object-src 'none'; base-uri 'none'; frame-ancestors 'none'; form-action 'self'${sso ? sso.formTargets().map(o => ` ${o}`).join('') : ''}`);
    // Presence, even with an empty value: never turn the public listener into a tester ingress.
    if (!tester && Object.hasOwn(req.headers, 'x-mosaic-tester')) return json(res, 403, { error: 'tester listener required' });
    if (tester && testerAuthHeader && Object.hasOwn(req.headers, testerAuthHeader.toLowerCase())) return json(res, 403, { error: 'proxy header refused' });
    if (tester && testerProofHeader && Object.hasOwn(req.headers, testerProofHeader.toLowerCase())) return json(res, 403, { error: 'proxy proof header refused' });
+    // Under --sso the tester listener reads no cookie and takes no sign-in of any kind (design section 6).
+    if (tester && testerNoSignIn && (Object.hasOwn(req.headers, 'authorization') || SIGN_IN_COOKIE.test(req.headers.cookie ?? '') || Object.keys(req.headers).some(h => h.startsWith('x-authentik-'))))
+      return json(res, 403, { error: 'tester listener takes no sign-in' });
    let path, search;
    // Node keeps the first of repeated Host headers; a second one (a loopback Host, then NAME) is
    // never legitimate, so it is refused before any check reads the Host.
    if ((req.headersDistinct.host?.length ?? 0) > 1) return json(res, 400, { error: 'repeated Host refused' });
    // Preview mode: a request for the public name, exactly, as the proxy forwards it.
-    const named = preview !== null && (req.headers.host ?? '').toLowerCase() === preview.host;
+    const named = preview !== null ? (req.headers.host ?? '').toLowerCase() === preview.host : sso !== null && (req.headers.host ?? '').toLowerCase() === sso.publicHost;
    // The proof precedes every auth-header read, including the wrong-Host fence.
    if (proof !== null) {
      const values = req.headersDistinct[proof.header];
@@ -512,19 +527,34 @@ export async function startServer({ host = '127.0.0.1', port = 7330, board = DEF
      }
      ({ pathname: path, search } = new URL(req.url, 'http://localhost'));
    } catch { return json(res, 400, { error: 'invalid URL' }); }
+    // Under --sso the human listener serves only the public Host, whatever its port; GET /healthz
+    // alone stays open on a loopback Host for the status and release gates (Q-C).
+    if (sso !== null && !named && !(path === '/healthz' && req.method === 'GET')) return json(res, 403, { error: 'public Host required' });
    // No CORS. JSON content type and same-origin checks keep browser forms out.
-    if (req.headers.origin && req.headers.origin !== (named ? `https://${preview.host}` : `http://${req.headers.host}`)) return json(res, 403, { error: 'cross-origin request refused' });
-    if (named) {
+    if (req.headers.origin && req.headers.origin !== (named ? (sso ? sso.publicOrigin : `https://${preview.host}`) : `http://${req.headers.host}`)) return json(res, 403, { error: 'cross-origin request refused' });
+    let signer = preview;
+    if (sso !== null && named) {
+      if (path.startsWith('/auth/')) return sso.handle(req, res, path, search);
+      // Only a page load or a write keeps a session alive; the page's background reads don't (Q-D).
+      const session = path === '/healthz' ? null : sso.session(req, { touch: req.method === 'POST' || (req.method === 'GET' && !path.startsWith('/api/')) });
+      if (!session && path !== '/healthz') {
+        if (path.startsWith('/api/') || req.method !== 'GET') return json(res, 401, { error: 'sign-in required' });
+        res.writeHead(303, { location: `/auth/login?return=${encodeURIComponent(path + search)}`, 'cache-control': 'no-store' });
+        return res.end();
+      }
+      if (session) signer = { sso: true, user: session.name, host: sso.publicHost, origin: sso.publicOrigin };
+    }
+    if (named && preview !== null) {
      // One value, equal to the user id; the proxy strips client copies and sets it after sign-in.
      const values = req.headersDistinct[preview.header];
      if (!values || values.length !== 1 || values[0] !== preview.user) return json(res, 401, { error: 'sign-in required' });
    }
-    const writer = tester ? { tester: true, user: 'tester', origin: `http://127.0.0.1:${server.address().port}` } : preview;
+    const writer = tester ? { tester: true, user: 'tester', origin: `http://127.0.0.1:${server.address().port}` } : signer;
    if (tester && !['GET', 'HEAD'].includes(req.method) && !['/api/instances', '/api/routes', '/api/name'].includes(path) && !TESTER_CHAT_WRITE.test(path))
      return json(res, 403, { error: 'read-only', sent: false });
    if(path==='/api/settings'&&req.method==='POST'){
      if(!send||!settingsWrite||!named)return json(res,403,{error:'read-only',sent:false});
-      return settingsSend(req,res,{settingsWrite,preview,log});
+      return settingsSend(req,res,{settingsWrite,preview:signer,log});
    }
    if (Object.hasOwn(SEAT_ROUTES, path)) {
      if (req.method !== 'POST') return json(res, 405, { error: 'method not allowed' });
@@ -544,18 +574,18 @@ export async function startServer({ host = '127.0.0.1', port = 7330, board = DEF
    }
    if (path === '/api/project-file' && req.method === 'POST') {
      if (!send || !projectSave || !named) return json(res, 403, { error: 'read-only', sent: false });
-      return projectFileSend(req, res, { projectSave, preview, log });
+      return projectFileSend(req, res, { projectSave, preview: signer, log });
    }
    // Message sending has its own bounded payload and repeats the identity check.
    if (send && path === '/api/bus/message') {
      if (req.method !== 'POST') return json(res, 405, { error: 'method not allowed' });
-      return busSend(req, res, { send, preview, log });
+      return busSend(req, res, { send, preview: signer, log });
    }
    if (path === '/api/chat' || path.startsWith('/api/chat/')) {
      return chatHTTP(req, res, { path, search, chat, named, send, preview: writer, log });
    }
    // Nothing else but GET and HEAD gets past here in preview mode, whatever the Host.
-    if (preview !== null && req.method !== 'GET' && req.method !== 'HEAD') return json(res, 403, { error: 'read-only', message: 'the Console preview is read-only' });
+    if ((preview !== null || sso !== null) && req.method !== 'GET' && req.method !== 'HEAD') return json(res, 403, { error: 'read-only', message: 'the Console preview is read-only' });
    // The conversation routes (#1507, CHAT-02) keep their query; the board validates it.
    const conversation = path === '/api/conversations' || path === '/api/conversation';
    const allowed = path === '/api/board' || conversation ? 'GET' : ['/api/seen', '/api/reply'].includes(path) ? 'POST' : null;
@@ -607,8 +637,8 @@ export async function startServer({ host = '127.0.0.1', port = 7330, board = DEF
    if (req.method !== 'GET' && req.method !== 'HEAD') return json(res, 405, { error: 'method not allowed' });
    // `send`: the page shows the composer only where a send can pass (the public name, --send on).
    // `edit`: the editor shows Save only where a save can pass, the same test as the route's.
-    if (path === '/api/config') return json(res, 200, { board: upstream, ...(tester ? { tester: true } : {}), send: !tester && Boolean(send) && named, edit: !tester && Boolean(send) && Boolean(projectSave) && named });
-    if (path === '/healthz') return json(res, 200, { ok: true });
+    if (path === '/api/config') return json(res, 200, { board: upstream, ...(tester ? { tester: true } : {}), ...(sso ? { sso: true } : {}), send: !tester && Boolean(send) && named, edit: !tester && Boolean(send) && Boolean(projectSave) && named });
+    if (path === '/healthz') return json(res, 200, { ok: true, ...(sso ? { sso: sso.health() } : {}) });
    if (path === '/favicon.ico') { res.writeHead(204); return res.end(); }
    const file = files.get(path);
    if (!file) return json(res, 404, { error: 'not found' });
@@ -0,0 +1,75 @@
+// Q175 phase 1 (#1690): the shape of config.json's optional `console` key. The one loader,
+// scripts/mosaic-config.mjs, runs this on every read, so a bad key refuses the config for every
+// tool (design section 4, C1). The Console's --sso start runs it again before it uses the value.
+// Shape only: nothing here touches the network or a slot file. A refusal names the key path and
+// never quotes a value, so a refusal can't print a client id or a subject.
+
+// The asymmetric algorithms oauth4webapi 3.8.8 verifies (its supported(), build/index.js). No HS*
+// and no none, so a client secret can never be a signing key.
+export const ALGS = Object.freeze(['PS256', 'ES256', 'RS256', 'PS384', 'ES384', 'RS384', 'PS512', 'ES512', 'RS512', 'Ed25519', 'EdDSA', 'ML-DSA-44', 'ML-DSA-65', 'ML-DSA-87']);
+const PROVIDER_ID = /^[a-z0-9-]{1,32}$/;
+const SLOT = /^[a-z0-9-]{1,64}$/;
+const SUB = /^[\x21-\x7e]{1,255}$/;
+const CLIENT_ID = /^[\x21-\x7e]{1,255}$/;
+// The name goes where the preview's --allow-user went (serve.mjs USER): visible ASCII, no comma.
+const NAME = /^[\x21-\x2b\x2d-\x7e]{1,64}$/;
+// The bus keeps these for the tester and the human role (section 6), so no subject can sign in as one.
+const RESERVED_NAMES = ['tester', 'human'];
+
+const object = v => typeof v === 'object' && v !== null && !Array.isArray(v);
+function refuse(where, why) {
+  throw new Error(`${where} ${why}`);
+}
+function keys(value, where, allowed, required = allowed) {
+  if (!object(value)) refuse(where, 'must be a JSON object');
+  for (const key of Object.keys(value)) if (!allowed.includes(key)) refuse(`${where}.${key}`, 'is not a supported key');
+  for (const key of required) if (!Object.hasOwn(value, key)) refuse(`${where}.${key}`, 'is required');
+}
+function httpsURL(value, where) {
+  let url;
+  if (typeof value !== 'string' || value.length > 512) refuse(where, 'must be an https URL of at most 512 characters');
+  try { url = new URL(value); } catch { refuse(where, 'must be an https URL'); }
+  if (url.protocol !== 'https:' || url.username || url.password || url.search || url.hash || value.includes('?') || value.includes('#')) {
+    refuse(where, 'must be https with no credentials, query or fragment');
+  }
+  return url;
+}
+
+// Returns the value unchanged when it passes; throws an Error naming the bad key path otherwise.
+export function checkConsole(value, where = 'console') {
+  keys(value, where, ['sso']);
+  const sso = value.sso, at = `${where}.sso`;
+  keys(sso, at, ['publicOrigin', 'providers']);
+  const origin = httpsURL(sso.publicOrigin, `${at}.publicOrigin`);
+  if (origin.origin !== sso.publicOrigin) refuse(`${at}.publicOrigin`, 'must be an https origin with no path, query, fragment or trailing slash');
+  if (!Array.isArray(sso.providers) || sso.providers.length === 0 || sso.providers.length > 8) refuse(`${at}.providers`, 'must be a list of 1 to 8 providers');
+  const ids = new Set();
+  sso.providers.forEach((p, i) => {
+    const pat = `${at}.providers[${i}]`;
+    keys(p, pat, ['id', 'issuer', 'clientId', 'clientSecret', 'algs', 'subjects']);
+    if (typeof p.id !== 'string' || !PROVIDER_ID.test(p.id)) refuse(`${pat}.id`, 'must match [a-z0-9-]{1,32}');
+    if (ids.has(p.id)) refuse(`${pat}.id`, 'repeats an earlier provider id');
+    ids.add(p.id);
+    httpsURL(p.issuer, `${pat}.issuer`);
+    if (typeof p.clientId !== 'string' || !CLIENT_ID.test(p.clientId)) refuse(`${pat}.clientId`, 'must be 1 to 255 visible characters');
+    keys(p.clientSecret, `${pat}.clientSecret`, ['slot']);
+    if (typeof p.clientSecret.slot !== 'string' || !SLOT.test(p.clientSecret.slot)) refuse(`${pat}.clientSecret.slot`, 'must match [a-z0-9-]{1,64}');
+    if (!Array.isArray(p.algs) || p.algs.length === 0) refuse(`${pat}.algs`, 'must be a non-empty list');
+    p.algs.forEach((alg, j) => {
+      if (!ALGS.includes(alg)) refuse(`${pat}.algs[${j}]`, `must be one of ${ALGS.join(', ')}; HS* and none are refused`);
+    });
+    if (new Set(p.algs).size !== p.algs.length) refuse(`${pat}.algs`, 'repeats an algorithm');
+    if (!Array.isArray(p.subjects) || p.subjects.length === 0 || p.subjects.length > 64) refuse(`${pat}.subjects`, 'must be a list of 1 to 64 subjects');
+    const subs = new Set();
+    p.subjects.forEach((s, j) => {
+      const sat = `${pat}.subjects[${j}]`;
+      keys(s, sat, ['sub', 'name']);
+      if (typeof s.sub !== 'string' || !SUB.test(s.sub)) refuse(`${sat}.sub`, 'must be 1 to 255 visible characters');
+      if (subs.has(s.sub)) refuse(`${sat}.sub`, 'repeats an earlier subject');
+      subs.add(s.sub);
+      if (typeof s.name !== 'string' || !NAME.test(s.name)) refuse(`${sat}.name`, 'must be 1 to 64 visible characters');
+      if (RESERVED_NAMES.includes(s.name.toLowerCase())) refuse(`${sat}.name`, `must not be ${RESERVED_NAMES.join(' or ')}`);
+    });
+  });
+  return value;
+}
@@ -0,0 +1,347 @@
+// Q175 phase 1 (#1690, design agents/sage/work/q175-sso/DESIGN.md): the Console as an OIDC relying
+// party. Used only by the human listener under --sso; startServer refuses it on the tester listener.
+// Every URL handed to a provider is built from the configured publicOrigin, never from a request's
+// Host. A refusal logs one fixed code and the provider id, never an exception, its message or its
+// cause: oauth4webapi's errors carry token bodies and claims there.
+import { createHash, randomBytes } from 'node:crypto';
+import { closeSync, constants, fstatSync, lstatSync, openSync, readFileSync, realpathSync } from 'node:fs';
+import { homedir } from 'node:os';
+import { join, relative, isAbsolute, resolve } from 'node:path';
+import { checkConsole } from './sso-config.mjs';
+
+// oauth4webapi loads in createSso, not here: cli.mjs imports this module on every start, and a
+// Console without --sso must not need the package (pinned-copy.test.mjs builds copies whose lock
+// installs nothing). A real copy installs it from the root lock.
+let oauth;
+
+export const SESSION_COOKIE = '__Host-mosaic_session';
+export const LOGIN_COOKIE = '__Host-mosaic_login';
+const ATTRS = 'Path=/; Secure; HttpOnly; SameSite=Lax';
+const LOGIN_MAX_AGE = 600;
+const SESSION_ABSOLUTE = 8 * 3600 * 1000, SESSION_IDLE = 3600 * 1000;
+const MAX_SESSIONS = 64, MAX_LOGINS = 32;
+const FETCH_TIMEOUT = 10000;
+const RETRY_CAP = 300000;
+const CODES = new Set(['login-record-missing', 'state-mismatch', 'auth-error-response', 'grant-failed', 'id-token-invalid', 'signature-invalid', 'alg-refused', 'issuer-mismatch', 'subject-unknown', 'discovery-failed', 'jwks-failed']);
+
+const sha256 = value => createHash('sha256').update(value).digest('hex');
+const escape = text => String(text).replace(/[&<>"']/g, c => `&#${c.charCodeAt(0)};`);
+const under = (parent, child) => { const rel = relative(parent, child); return rel === '' || (!rel.startsWith('..') && !isAbsolute(rel)); };
+
+// The slot file holding a provider's client secret (design section 4, D1). Only the Console's --sso
+// start calls this. A refusal names the provider and the check, never the path's contents.
+export function readSlot(configDir, provider, { repo, checkout = null, copies = join(process.env.XDG_DATA_HOME || join(homedir(), '.local', 'share'), 'mosaic-stack', 'copies') } = {}) {
+  const where = `console.sso provider ${provider.id} client secret slot`;
+  const file = join(resolve(configDir), 'secrets', 'mosaic-stack', provider.clientSecret.slot);
+  let st;
+  try { st = lstatSync(file); } catch { throw new Error(`${where} is missing`); }
+  if (st.isSymbolicLink()) throw new Error(`${where} must not be a symbolic link`);
+  let fd, real, text;
+  try {
+    fd = openSync(file, constants.O_RDONLY | constants.O_NOFOLLOW | constants.O_NONBLOCK);
+    st = fstatSync(fd);
+    if (!st.isFile()) throw new Error(`${where} must be a regular file`);
+    if (st.uid !== process.getuid()) throw new Error(`${where} must be owned by the Console's user`);
+    if (st.mode & 0o077) throw new Error(`${where} must have no group or other permission bits`);
+    real = realpathSync(file);
+    for (const root of [repo, checkout, copies].filter(Boolean)) {
+      let base;
+      try { base = realpathSync(root); } catch { base = resolve(root); }
+      if (under(base, real)) throw new Error(`${where} must not be inside the repository or a stack copy`);
+    }
+    text = readFileSync(fd, 'utf8');
+  } catch (err) {
+    throw err.message?.startsWith(where) ? err : new Error(`${where} is not readable`);
+  } finally {
+    if (fd !== undefined) closeSync(fd);
+  }
+  const secret = text.endsWith('\n') ? text.slice(0, -1) : text;
+  if (!secret || /[\r\n]/.test(secret)) throw new Error(`${where} must hold one non-empty line`);
+  return secret;
+}
+
+export function cookies(req, name) {
+  const found = [];
+  for (const part of (req.headers.cookie ?? '').split(';')) {
+    const at = part.indexOf('=');
+    if (at > 0 && part.slice(0, at).trim() === name) found.push(part.slice(at + 1).trim());
+  }
+  return found;
+}
+
+// The JWKS check at discovery, the same filter the library's key selection uses (kty, alg, use,
+// key_ops, crv; RSA at least 2048 bits), without a kid since no token is at hand yet.
+function usableKey(jwk, alg) {
+  const kty = { RS: 'RSA', PS: 'RSA', ES: 'EC', Ed: 'OKP', ML: 'AKP' }[alg.slice(0, 2)];
+  if (jwk === null || typeof jwk !== 'object' || jwk.kty !== kty) return false;
+  if (jwk.alg !== undefined && jwk.alg !== alg) return false;
+  if (jwk.use !== undefined && jwk.use !== 'sig') return false;
+  if (Array.isArray(jwk.key_ops) && !jwk.key_ops.includes('verify')) return false;
+  const crv = { ES256: 'P-256', ES384: 'P-384', ES512: 'P-521', Ed25519: 'Ed25519', EdDSA: 'Ed25519' }[alg];
+  if (crv && jwk.crv !== crv) return false;
+  if (kty === 'RSA' && (typeof jwk.n !== 'string' || Buffer.from(jwk.n, 'base64url').length * 8 < 2048)) return false;
+  return true;
+}
+
+class Unreachable extends Error {}
+class Refused extends Error {}
+const https = value => { try { return new URL(value).protocol === 'https:'; } catch { return false; } };
+
+// One provider's discovery and JWKS. Throws Unreachable (network, timeout, a status other than 200,
+// a body that isn't JSON) or Refused (a JSON document that fails a check). Q-B, design section 4.
+async function discover(p, fetchOptions) {
+  let response, text;
+  const options = () => ({ ...fetchOptions, signal: AbortSignal.timeout(FETCH_TIMEOUT) });
+  try {
+    response = await oauth.discoveryRequest(new URL(p.issuer), options());
+    if (response.status !== 200 || !/^application\/json\b/i.test(response.headers.get('content-type') ?? '')) throw new Error();
+    text = await response.text();
+    JSON.parse(text);
+  } catch { throw new Unreachable(); }
+  let as;
+  try {
+    as = await oauth.processDiscoveryResponse(new URL(p.issuer), new Response(text, { status: 200, headers: { 'content-type': 'application/json' } }));
+  } catch { throw new Refused(); }
+  if (as.issuer !== p.issuer) throw new Refused();
+  if (!Array.isArray(as.id_token_signing_alg_values_supported) || !p.algs.some(a => as.id_token_signing_alg_values_supported.includes(a))) throw new Refused();
+  if (!Array.isArray(as.code_challenge_methods_supported) || !as.code_challenge_methods_supported.includes('S256')) throw new Refused();
+  if (![as.authorization_endpoint, as.token_endpoint, as.jwks_uri].every(https)) throw new Refused();
+  if (as.end_session_endpoint !== undefined && !https(as.end_session_endpoint)) throw new Refused();
+  let jwks;
+  try {
+    const fetcher = fetchOptions[oauth.customFetch] ?? fetch;
+    const res = await fetcher(as.jwks_uri, { method: 'GET', headers: { accept: 'application/json, application/jwk-set+json' }, redirect: 'manual', signal: AbortSignal.timeout(FETCH_TIMEOUT) });
+    if (res.status !== 200) throw new Error();
+    jwks = JSON.parse(await res.text());
+  } catch { throw new Unreachable(); }
+  if (jwks === null || typeof jwks !== 'object' || !Array.isArray(jwks.keys)) throw new Refused();
+  const usable = p.algs.filter(alg => jwks.keys.some(k => usableKey(k, alg)));
+  if (!usable.length) throw new Refused();
+  return as;
+}
+
+// `config` is console.sso, checked again here; `secrets` maps provider id to its client secret
+// (readSlot). `fetch` is for tests: a fetch that trusts only the fake OP's certificate.
+// `retryFirst` is for tests too; production waits 5 s, doubling, capped at 5 minutes.
+export async function createSso(config, { secrets, fetch: customFetch = null, log = line => console.log(line), retryFirst = 5000 } = {}) {
+  checkConsole({ sso: config });
+  oauth ??= await import('oauth4webapi');
+  const publicOrigin = config.publicOrigin;
+  const publicHost = new URL(publicOrigin).host;
+  const redirectUri = `${publicOrigin}/auth/callback`;
+  const fetchOptions = customFetch ? { [oauth.customFetch]: customFetch } : {};
+  const sessions = new Map(), logins = new Map();
+  const timers = new Set();
+  let closed = false;
+  const refuse = (code, provider, extra = '') => {
+    if (!CODES.has(code)) throw new Error(`unknown sso log code ${code}`);
+    log(`${new Date().toISOString()} sso refused code=${code} provider=${provider}${extra}`);
+  };
+
+  const providers = new Map(config.providers.map(p => {
+    if (typeof secrets?.get(p.id) !== 'string') throw new Error(`console.sso provider ${p.id} has no client secret`);
+    return [p.id, {
+      config: p, state: 'unreachable', as: null, jwks: {},
+      client: { client_id: p.clientId, id_token_signed_response_alg: [...p.algs] },
+      auth: oauth.ClientSecretBasic(secrets.get(p.id)),
+      subjects: new Map(p.subjects.map(s => [s.sub, s.name])),
+    }];
+  }));
+
+  async function attempt(entry, atStart) {
+    try {
+      entry.as = await discover(entry.config, fetchOptions);
+      entry.jwks = {};
+      entry.state = 'ready';
+    } catch (err) {
+      if (err instanceof Refused) {
+        entry.state = 'refused';
+        refuse('discovery-failed', entry.config.id);
+        if (atStart) throw new Error(`console.sso provider ${entry.config.id} refused at discovery: the issuer, algorithms, S256 or JWKS check failed`);
+        return;
+      }
+      entry.state = 'unreachable';
+      refuse('discovery-failed', entry.config.id);
+      throw err;
+    }
+  }
+  function retry(entry, delay) {
+    if (closed) return;
+    const timer = setTimeout(async () => {
+      timers.delete(timer);
+      try { await attempt(entry, false); } catch { retry(entry, Math.min(delay * 2, RETRY_CAP)); }
+    }, delay);
+    timer.unref();
+    timers.add(timer);
+  }
+  for (const entry of providers.values()) {
+    try { await attempt(entry, true); } catch (err) {
+      if (!(err instanceof Unreachable)) throw err;
+      retry(entry, retryFirst);
+    }
+  }
+
+  const page = (res, status, title, html, headers = {}) => {
+    res.writeHead(status, { 'content-type': 'text/html; charset=utf-8', 'cache-control': 'no-store', ...headers });
+    res.end(`<!doctype html><meta charset="utf-8"><title>${escape(title)}</title><main style="font-family:sans-serif;max-width:32rem;margin:4rem auto"><h1>${escape(title)}</h1>${html}</main>\n`);
+  };
+  const redirect = (res, location, setCookie = []) => {
+    res.writeHead(303, { location, 'cache-control': 'no-store', ...(setCookie.length ? { 'set-cookie': setCookie } : {}) });
+    res.end();
+  };
+  const failed = (res, setCookie = []) => page(res, 403, 'Sign-in failed', '<p><a href="/auth/login">Sign in again</a></p>', setCookie.length ? { 'set-cookie': setCookie } : {});
+  const expire = name => `${name}=; ${ATTRS}; Max-Age=0`;
+  const remember = (map, key, value, cap) => {
+    while (map.size >= cap) map.delete(map.keys().next().value);
+    map.set(key, value);
+  };
+
+  // B2: only a URL on publicOrigin itself; anything else, or nothing, is publicOrigin's `/`. The
+  // Location is absolute and its origin checked again: dot segments can leave a pathname of `//host`,
+  // which as a relative Location a browser reads as another origin (webby-0019 B1, sage-1403).
+  function returnURL(ret) {
+    const home = `${publicOrigin}/`;
+    try {
+      if (typeof ret !== 'string' || !ret) return home;
+      const u = new URL(ret, publicOrigin);
+      if (u.origin !== publicOrigin) return home;
+      const out = new URL(`${publicOrigin}${u.pathname}${u.search}`);
+      return out.origin === publicOrigin ? out.href : home;
+    } catch { return home; }
+  }
+
+  async function start(res, entry, ret) {
+    const state = oauth.generateRandomState(), nonce = oauth.generateRandomNonce(), verifier = oauth.generateRandomCodeVerifier();
+    const challenge = await oauth.calculatePKCECodeChallenge(verifier);
+    const id = randomBytes(32).toString('base64url');
+    remember(logins, sha256(id), { provider: entry.config.id, state, nonce, verifier, ret: typeof ret === 'string' ? ret.slice(0, 2048) : '/', expires: Date.now() + LOGIN_MAX_AGE * 1000 }, MAX_LOGINS);
+    const url = new URL(entry.as.authorization_endpoint);
+    for (const [k, v] of Object.entries({ client_id: entry.config.clientId, response_type: 'code', scope: 'openid profile email', redirect_uri: redirectUri, state, nonce, code_challenge: challenge, code_challenge_method: 'S256' })) url.searchParams.set(k, v);
+    return redirect(res, url.href, [`${LOGIN_COOKIE}=${id}; ${ATTRS}; Max-Age=${LOGIN_MAX_AGE}`]);
+  }
+
+  function login(res, query) {
+    const asked = query.get('provider');
+    const ret = query.get('return');
+    if (asked === null && providers.size > 1) {
+      const items = [...providers.values()].map(e => `<li><a href="/auth/login?${escape(new URLSearchParams({ provider: e.config.id, ...(ret ? { return: ret } : {}) }))}">${escape(e.config.id)}</a></li>`).join('');
+      return page(res, 200, 'Sign in', `<ul>${items}</ul>`);
+    }
+    const entry = asked === null ? [...providers.values()][0] : providers.get(asked);
+    if (!entry) return page(res, 404, 'Unknown sign-in provider', '<p><a href="/auth/login">Sign in</a></p>');
+    if (entry.state !== 'ready') return page(res, 503, 'sign-in unavailable', '<p>The sign-in provider can\'t be reached. Try again shortly.</p>');
+    return start(res, entry, ret);
+  }
+
+  // Design section 1, steps 2-7. Each refusal ends here with one log line and the 403 page.
+  async function callback(res, query, req) {
+    const clear = [expire(LOGIN_COOKIE)];
+    const ids = cookies(req, LOGIN_COOKIE);
+    const key = ids.length === 1 ? sha256(ids[0]) : null;
+    const record = key === null ? undefined : logins.get(key);
+    if (key !== null) logins.delete(key);
+    // The provider comes from the record, never from the query.
+    const entry = record && providers.get(record.provider);
+    if (!record || record.expires <= Date.now() || !entry) {
+      refuse('login-record-missing', record?.provider ?? 'none');
+      return failed(res, clear);
+    }
+    const pid = entry.config.id;
+    if (entry.state !== 'ready') { refuse('discovery-failed', pid); return failed(res, clear); }
+    let params;
+    try { params = oauth.validateAuthResponse(entry.as, entry.client, query, record.state); } catch (err) {
+      refuse(err instanceof oauth.AuthorizationResponseError ? 'auth-error-response' : 'state-mismatch', pid);
+      return failed(res, clear);
+    }
+    const options = () => ({ ...fetchOptions, [oauth.jwksCache]: entry.jwks, signal: AbortSignal.timeout(FETCH_TIMEOUT) });
+    let response;
+    try { response = await oauth.authorizationCodeGrantRequest(entry.as, entry.client, entry.auth, params, redirectUri, record.verifier, options()); } catch {
+      refuse('grant-failed', pid); return failed(res, clear);
+    }
+    let result, claims;
+    try {
+      result = await oauth.processAuthorizationCodeResponse(entry.as, entry.client, response, { expectedNonce: record.nonce, requireIdToken: true });
+      claims = oauth.getValidatedIdTokenClaims(result);
+    } catch (err) {
+      refuse(err instanceof oauth.ResponseBodyError ? 'grant-failed' : 'id-token-invalid', pid);
+      return failed(res, clear);
+    }
+    // Step 5: the library skips this for a token-endpoint ID token; point 2 needs it, on the same
+    // Response object. Its throw ends the callback.
+    try { await oauth.validateApplicationLevelSignature(entry.as, response, options()); } catch (err) {
+      const fetching = !(err instanceof oauth.OperationProcessingError || err instanceof oauth.UnsupportedOperationError) || [oauth.RESPONSE_IS_NOT_CONFORM, oauth.RESPONSE_IS_NOT_JSON].includes(err.code);
+      refuse(fetching ? 'jwks-failed' : 'signature-invalid', pid);
+      return failed(res, clear);
+    }
+    // Step 6: our own checks on top of the library's.
+    let header;
+    try { header = JSON.parse(Buffer.from(result.id_token.split('.')[0], 'base64url').toString('utf8')); } catch { header = null; }
+    if (!header || !entry.config.algs.includes(header.alg)) { refuse('alg-refused', pid); return failed(res, clear); }
+    if (claims.iss !== entry.config.issuer) { refuse('issuer-mismatch', pid); return failed(res, clear); }
+    const name = typeof claims.sub === 'string' ? entry.subjects.get(claims.sub) : undefined;
+    if (name === undefined) {
+      refuse('subject-unknown', pid, ` iss=${JSON.stringify(String(claims.iss).slice(0, 255))} sub=${JSON.stringify(String(claims.sub).slice(0, 255))}`);
+      return failed(res, clear);
+    }
+    // Step 7: the session, then the return path.
+    const id = randomBytes(32).toString('base64url'), now = Date.now();
+    remember(sessions, sha256(id), { provider: pid, iss: claims.iss, sub: claims.sub, name, idToken: result.id_token, created: now, seen: now }, MAX_SESSIONS);
+    return redirect(res, returnURL(record.ret), [...clear, `${SESSION_COOKIE}=${id}; ${ATTRS}`]);
+  }
+
+  // The session for this request, or null. `touch` is true only for a page load or a write (Q-D).
+  function session(req, { touch = false } = {}) {
+    const ids = cookies(req, SESSION_COOKIE);
+    if (ids.length !== 1) return null;
+    const key = sha256(ids[0]);
+    const s = sessions.get(key);
+    if (!s) return null;
+    const now = Date.now();
+    if (now - s.created >= SESSION_ABSOLUTE || now - s.seen >= SESSION_IDLE) { sessions.delete(key); return null; }
+    if (touch) s.seen = now;
+    return s;
+  }
+
+  function logout(req, res) {
+    const one = name => (req.headersDistinct[name]?.length === 1 ? req.headersDistinct[name][0] : null);
+    if (one('origin') !== publicOrigin || one('sec-fetch-site') !== 'same-origin') {
+      return page(res, 403, 'Sign-out refused', '<p>Sign out from the Console page.</p>');
+    }
+    const ids = cookies(req, SESSION_COOKIE);
+    const key = ids.length === 1 ? sha256(ids[0]) : null;
+    const s = key === null ? undefined : sessions.get(key);
+    if (key !== null) sessions.delete(key);
+    const entry = s && providers.get(s.provider);
+    let location = `${publicOrigin}/auth/signed-out`;
+    if (entry?.as?.end_session_endpoint) {
+      const url = new URL(entry.as.end_session_endpoint);
+      url.searchParams.set('id_token_hint', s.idToken);
+      url.searchParams.set('post_logout_redirect_uri', `${publicOrigin}/auth/signed-out`);
+      url.searchParams.set('client_id', entry.config.clientId);
+      location = url.href;
+    }
+    return redirect(res, location, [expire(SESSION_COOKIE)]);
+  }
+
+  // `/auth/*` on the human listener; the caller has already checked the Host.
+  async function handle(req, res, path, search) {
+    const query = new URLSearchParams(search);
+    if (path === '/auth/logout') {
+      if (req.method !== 'POST') return page(res, 405, 'Method not allowed', '');
+      return logout(req, res);
+    }
+    if (req.method !== 'GET') return page(res, 405, 'Method not allowed', '');
+    if (path === '/auth/login') return login(res, query);
+    if (path === '/auth/callback') return callback(res, query, req);
+    if (path === '/auth/signed-out') return page(res, 200, 'Signed out', '<p><a href="/auth/login">Sign in</a></p>');
+    return page(res, 404, 'Not found', '');
+  }
+
+  return {
+    publicOrigin, publicHost, sessions, logins, handle, session, returnURL,
+    health: () => Object.fromEntries([...providers].map(([id, e]) => [id, e.state])),
+    formTargets: () => [...new Set([...providers.values()].filter(e => e.as?.end_session_endpoint).map(e => new URL(e.as.end_session_endpoint).origin))],
+    summary: () => config.providers.map(p => ({ id: p.id, issuer: p.issuer, subjects: p.subjects.length })),
+    close() { closed = true; for (const t of timers) clearTimeout(t); timers.clear(); },
+  };
+}
@@ -0,0 +1,155 @@
+// Q175 phase 1 (#1690, design section 9): a fake OpenID provider for the --sso tests. A loopback
+// https server with a self-signed certificate made in a temp dir; `op.fetch` is a fetch that trusts
+// only that certificate, so the code under test needs no insecure flag. It serves any number of
+// issuers (`/<name>/`) at once, each with discovery, a JWKS, authorization, token and end-session
+// endpoints. Keys come from node:crypto. Nothing here reaches any other host.
+import { constants, createHash, createHmac, generateKeyPairSync, randomBytes, sign } from 'node:crypto';
+import { spawnSync } from 'node:child_process';
+import { mkdtempSync, readFileSync, rmSync } from 'node:fs';
+import { createServer, request } from 'node:https';
+import { tmpdir } from 'node:os';
+import { join } from 'node:path';
+
+export const b64url = value => Buffer.from(typeof value === 'string' ? value : JSON.stringify(value)).toString('base64url');
+
+export function rsaKey(kid = `rsa-${randomBytes(4).toString('hex')}`, bits = 2048) {
+  const { privateKey, publicKey } = generateKeyPairSync('rsa', { modulusLength: bits });
+  return { kid, alg: 'RS256', privateKey, jwk: { ...publicKey.export({ format: 'jwk' }), kid, use: 'sig', alg: 'RS256' } };
+}
+export function ecKey(kid = `ec-${randomBytes(4).toString('hex')}`) {
+  const { privateKey, publicKey } = generateKeyPairSync('ec', { namedCurve: 'P-256' });
+  return { kid, alg: 'ES256', privateKey, jwk: { ...publicKey.export({ format: 'jwk' }), kid, use: 'sig', alg: 'ES256' } };
+}
+export function psKey(kid = `ps-${randomBytes(4).toString('hex')}`) {
+  const k = rsaKey(kid);
+  return { ...k, alg: 'PS256', jwk: { ...k.jwk, alg: 'PS256' } };
+}
+
+// A compact JWS. `alg` HS256 uses `hmac` as the key, `none` has an empty signature.
+export function jwt(header, payload, { key = null, hmac = null } = {}) {
+  const input = `${b64url(header)}.${b64url(payload)}`;
+  let sig = '';
+  if (header.alg === 'HS256') sig = createHmac('sha256', hmac).update(input).digest('base64url');
+  else if (header.alg === 'RS256') sig = sign('sha256', Buffer.from(input), key).toString('base64url');
+  else if (header.alg === 'PS256') sig = sign('sha256', Buffer.from(input), { key, padding: constants.RSA_PKCS1_PSS_PADDING, saltLength: 32 }).toString('base64url');
+  else if (header.alg === 'ES256') sig = sign('sha256', Buffer.from(input), { key, dsaEncoding: 'ieee-p1363' }).toString('base64url');
+  return `${input}.${sig}`;
+}
+
+function certificate() {
+  const dir = mkdtempSync(join(tmpdir(), 'fake-oidc-'));
+  try {
+    const r = spawnSync('openssl', ['req', '-x509', '-newkey', 'ec', '-pkeyopt', 'ec_paramgen_curve:P-256', '-nodes', '-days', '1',
+      '-subj', '/CN=127.0.0.1', '-addext', 'subjectAltName=IP:127.0.0.1', '-keyout', join(dir, 'key.pem'), '-out', join(dir, 'cert.pem')], { encoding: 'utf8' });
+    if (r.status !== 0) throw new Error(`openssl failed: ${r.stderr}`);
+    return { key: readFileSync(join(dir, 'key.pem')), cert: readFileSync(join(dir, 'cert.pem')) };
+  } finally { rmSync(dir, { recursive: true, force: true }); }
+}
+
+// One issuer's state. `discovery` is merged over the defaults; `mode` is 'ok', 'down' (the socket is
+// destroyed) or 'html' (200 with an HTML page) for discovery.
+function issuerState(name, base, opts) {
+  const keys = opts.keys ?? [rsaKey()];
+  return {
+    name, issuer: `${base}/${name}/`, keys, retired: [], clientId: opts.clientId ?? `client-${name}`, clientSecret: opts.clientSecret ?? `secret-${name}-${randomBytes(6).toString('hex')}`,
+    discovery: opts.discovery ?? {}, mode: 'ok', jwksOverride: null, codes: new Map(), acceptTwice: false, requirePkce: true,
+    tokenRequests: [], authorizeRequests: [], jwksFetches: 0, discoveryFetches: 0,
+  };
+}
+
+export async function fakeOidc() {
+  const { key, cert } = certificate();
+  const issuers = new Map();
+  const server = createServer({ key, cert }, (req, res) => {
+    const url = new URL(req.url, 'https://127.0.0.1');
+    const [, name, ...rest] = url.pathname.split('/');
+    const iss = issuers.get(name);
+    const route = rest.join('/');
+    const json = (status, body, type = 'application/json') => { res.writeHead(status, { 'content-type': type }); res.end(typeof body === 'string' ? body : JSON.stringify(body)); };
+    if (!iss) return json(404, { error: 'no issuer' });
+    if (route === '.well-known/openid-configuration') {
+      iss.discoveryFetches++;
+      if (iss.mode === 'down') return req.socket.destroy();
+      if (iss.mode === 'html') return json(200, '<!doctype html><title>Sign in</title>', 'text/html');
+      return json(200, discovery(iss));
+    }
+    if (route === 'jwks') {
+      iss.jwksFetches++;
+      return json(200, iss.jwksOverride ?? { keys: iss.keys.map(k => k.jwk) });
+    }
+    if (route === 'authorize') { iss.authorizeRequests.push(Object.fromEntries(url.searchParams)); return json(200, { ok: true }); }
+    if (route === 'end-session') return json(200, { ok: true });
+    if (route === 'token' && req.method === 'POST') {
+      let text = '';
+      req.on('data', c => (text += c));
+      req.on('end', () => {
+        const form = new URLSearchParams(text);
+        const basic = Buffer.from((req.headers.authorization ?? '').replace(/^Basic /, ''), 'base64').toString();
+        const [id, secret] = basic.split(':').map(decodeURIComponent);
+        iss.tokenRequests.push({ form: Object.fromEntries(form), clientId: id });
+        if (id !== iss.clientId || secret !== iss.clientSecret) return json(401, { error: 'invalid_client' });
+        const grant = iss.codes.get(form.get('code'));
+        if (!grant) return json(400, { error: 'invalid_grant' });
+        if (!iss.acceptTwice) iss.codes.delete(form.get('code'));
+        if (form.get('redirect_uri') !== grant.redirectUri) return json(400, { error: 'invalid_grant', error_description: 'redirect_uri' });
+        if (iss.requirePkce && createHash('sha256').update(form.get('code_verifier') ?? '').digest('base64url') !== grant.challenge) return json(400, { error: 'invalid_grant', error_description: 'pkce' });
+        return json(200, { access_token: randomBytes(16).toString('hex'), token_type: 'Bearer', expires_in: 300, id_token: grant.idToken });
+      });
+      return;
+    }
+    return json(404, { error: 'not found' });
+  });
+  await new Promise(r => server.listen(0, '127.0.0.1', r));
+  const base = `https://127.0.0.1:${server.address().port}`;
+
+  const discovery = iss => ({
+    issuer: iss.issuer, authorization_endpoint: `${iss.issuer}authorize`, token_endpoint: `${iss.issuer}token`, jwks_uri: `${iss.issuer}jwks`,
+    end_session_endpoint: `${iss.issuer}end-session`, response_types_supported: ['code'], subject_types_supported: ['public'],
+    id_token_signing_alg_values_supported: [...new Set(iss.keys.map(k => k.alg))], code_challenge_methods_supported: ['S256'],
+    ...iss.discovery,
+  });
+
+  // A fetch over node:https that trusts only this certificate. oauth4webapi passes a Headers object
+  // and a string or URLSearchParams body.
+  const opFetch = (input, init = {}) => new Promise((resolve, reject) => {
+    const url = new URL(typeof input === 'string' ? input : input.href ?? input.url);
+    if (url.protocol !== 'https:' || url.hostname !== '127.0.0.1' || url.port !== String(server.address().port)) return reject(new TypeError(`fake OP fetch refuses ${url.origin}`));
+    const headers = Object.fromEntries(new Headers(init.headers ?? {}));
+    const body = init.body === undefined || init.body === null ? undefined : String(init.body);
+    if (body !== undefined) headers['content-length'] = Buffer.byteLength(body);
+    const req = request(url, { method: init.method ?? 'GET', headers, ca: cert, signal: init.signal }, res => {
+      const chunks = [];
+      res.on('data', c => chunks.push(c));
+      res.on('end', () => {
+        const h = new Headers();
+        for (const [k, v] of Object.entries(res.headers)) h.set(k, Array.isArray(v) ? v.join(', ') : v);
+        const response = new Response(res.statusCode === 204 ? null : Buffer.concat(chunks), { status: res.statusCode, headers: h });
+        Object.defineProperty(response, 'url', { value: url.href });
+        resolve(response);
+      });
+      res.on('error', reject);
+    });
+    req.on('error', reject);
+    req.end(body);
+  });
+
+  return {
+    base, fetch: opFetch, cert,
+    issuer(name, opts = {}) { const iss = issuerState(name, base, opts); issuers.set(name, iss); return iss; },
+    // A code for `iss` whose ID token is built from the start redirect's nonce, the claims and header
+    // overrides. `challenge` defaults to the start redirect's; `idToken` replaces the token outright.
+    grant(iss, authorizeUrl, { sub = `user-${iss.name}`, claims = {}, header = {}, key = iss.keys[0], idToken = null, challenge = null, redirectUri = null } = {}) {
+      const q = new URL(authorizeUrl).searchParams;
+      const now = Math.floor(Date.now() / 1000);
+      const payload = { iss: iss.issuer, sub, aud: iss.clientId, iat: now, exp: now + 300, nonce: q.get('nonce'), ...claims };
+      for (const [k, v] of Object.entries(payload)) if (v === undefined) delete payload[k];
+      const token = idToken ?? jwt({ alg: key.alg, kid: key.kid, typ: 'JWT', ...header }, payload, { key: key.privateKey, hmac: iss.clientSecret });
+      const code = randomBytes(12).toString('base64url');
+      iss.codes.set(code, { idToken: token, challenge: challenge ?? q.get('code_challenge'), redirectUri: redirectUri ?? q.get('redirect_uri') });
+      return { code, idToken: token, payload };
+    },
+    rotate(iss, next = rsaKey()) { iss.retired.push(...iss.keys); iss.keys = [next]; return next; },
+    close: () => new Promise(r => { server.close(r); server.closeAllConnections(); }),
+  };
+}
+
@@ -30,7 +30,7 @@ function fakeCopy(dir) {
  writeFileSync(join(copyRoot(dir), 'packages', 'webui', 'src', 'cli.mjs'), '');
  return copyRoot(dir);
 }
-const SEND_REFUSAL = /^webui-service: --send needs the preview mode \(--public-host, --auth-header and --allow-user\)$/m;
+const SEND_REFUSAL = /^webui-service: --send needs the preview mode \(--public-host, --auth-header and --allow-user\) or --sso$/m;
 const TEMPLATE = readFileSync(join(REPO, 'packages', 'webui', 'systemd', 'mosaic-webui.service.in'), 'utf8');

 // The unit as the base script renders it (row 75): the template with its four
@@ -0,0 +1,132 @@
+// Q175 phase 1 (#1690, design test 24, sage-1340 F1, sage-1347 F7): the page under --sso. A read
+// the Console answers 401 `sign-in required` signs the page out the way a proxy redirect does, and
+// the line links to /auth/login with the current path and query; any other 401 stays an error. Both
+// fetch paths in app.js and both in bus.js (fetchRead and fetchApi) do it. The Sign out form shows
+// only when /api/config says sso. The board-held.test.mjs stub, with two lists of paths: those in
+// window.__signIn answer 401 `sign-in required`, those in window.__other 401 `unauthenticated`. A
+// page URL holding `sso` gets `sso: true` added to /api/config. Poll timers fire after 150 ms.
+import { test } from 'node:test';
+import assert from 'node:assert/strict';
+import { mkdtempSync, rmSync } from 'node:fs';
+import { tmpdir } from 'node:os';
+import { join } from 'node:path';
+import { Store } from '../../bus/src/store.mjs';
+import { Broker } from '../../bus/src/broker.mjs';
+import { views } from '../../bus/src/views.mjs';
+import { startServer } from '../src/serve.mjs';
+import { browser } from './browser.mjs';
+import { fixture, close } from './fixture.mjs';
+
+const businesses = { demo: { id: 'demo', human: 'jason', arbiters: { technical: 'cto', delivery: 'pm' }, roles: { pm: { authority: { withinRole: ['message.send'], crossRole: [] } }, cto: { authority: { withinRole: ['message.send'], crossRole: [] } } } } };
+
+const stub = `(() => {
+  const real = window.fetch.bind(window);
+  window.__reqs = []; window.__signIn = []; window.__other = [];
+  const timeout = window.setTimeout.bind(window);
+  window.setTimeout = (f, ms, ...rest) => timeout(f, ms === 10000 ? 150 : ms, ...rest);
+  const answer = (status, body) => new Response(JSON.stringify(body), { status, headers: { 'content-type': 'application/json' } });
+  window.fetch = async (url, init = {}) => {
+    const path = String(url).split('?')[0];
+    window.__reqs.push(path);
+    if (window.__signIn.includes(path)) return answer(401, { error: 'sign-in required' });
+    if (window.__other.includes(path)) return answer(401, { error: 'unauthenticated' });
+    if (path === '/api/config' && /sso/.test(location.search)) return answer(200, { ...(await (await real(url, init)).json()), sso: true });
+    return real(url, init);
+  };
+})();`;
+
+async function setup() {
+  const root = mkdtempSync(join(tmpdir(), 'webui-sso-browser-'));
+  const store = new Store(root), b0 = new Broker({ store, businesses });
+  b0.request(b0.bindLaunch({ business: 'demo', role: 'pm', run: 'pm-run', harness: 'pi', address: 'pm-run' }), { verb: 'role.claim' });
+  const reader = b0.bindReader({ business: 'demo' });
+  const bus = views({ call: async (verb, args = {}) => structuredClone(b0.request(reader, { verb, args })) });
+  const f = await fixture(), b = await browser({ machine: true });
+  const web = await startServer({ port: 0, board: f.boardURL, bus }), base = `http://127.0.0.1:${web.address().port}/`;
+  await b.call('Page.addScriptToEvaluateOnNewDocument', { source: stub });
+  await b.viewport(1280);
+  const wait = expr => b.evaluate(`(async()=>{for(let i=0;i<100;i++){if(${expr})return true;await new Promise(r=>setTimeout(r,50))}throw new Error('Condition timed out: '+${JSON.stringify(expr)})})()`);
+  const text = sel => b.evaluate(`document.querySelector(${JSON.stringify(sel)})?.textContent ?? null`);
+  const shown = sel => b.evaluate(`(()=>{const e=document.querySelector(${JSON.stringify(sel)});return !!e && !e.hidden && getComputedStyle(e).display !== 'none' && !!e.getClientRects().length})()`);
+  const reqs = () => b.evaluate('window.__reqs.length');
+  const settle = () => new Promise(r => setTimeout(r, 600));
+  const done = async () => { await b.close(); await close(web); await f.close(); store.close(); rmSync(root, { recursive: true, force: true }); };
+  return { b, base, wait, text, shown, reqs, settle, done };
+}
+
+const LOADED = 'document.querySelector("table.sessions [data-open=\'proj/agent1\']")';
+const LINE = 'Signed out. Sign in again.';
+
+test('a 401 sign-in required on each fetch path signs the page out with a sign-in link and stops the refresh; another 401 stays an error', { timeout: 120000 }, async () => {
+  const { b, base, wait, text, shown, reqs, settle, done } = await setup();
+  // The line, its link back to this page, the Sign out form gone, and no further fetch.
+  const out = async ret => {
+    await wait('!document.querySelector("#signed-out").hidden');
+    assert.equal(await text('#signed-out'), LINE);
+    assert.equal(await b.evaluate('document.querySelector("#signed-out a").getAttribute("href")'), `/auth/login?return=${encodeURIComponent(ret)}`);
+    assert.equal(await shown('#sign-out'), false);
+    assert.equal(await b.evaluate('document.querySelector("#refresh").disabled'), true);
+    const n = await reqs();
+    await b.evaluate('document.querySelector("#refresh").click(), true');
+    await settle();
+    assert.equal(await reqs(), n, 'the page fetched after signing out');
+  };
+  try {
+    // app.js api(): the Board read, with sso on from /api/config.
+    await b.navigate(`${base}?sso&x=1`);
+    await wait(LOADED);
+    await b.evaluate(`window.__signIn.push('/api/board'), document.querySelector('#refresh').click(), true`);
+    await out('/?sso&x=1');
+
+    // app.js getJSON: the conversation catalogue behind History.
+    await b.navigate(`${base}?sso&conv`);
+    await wait(LOADED);
+    await b.evaluate(`window.__signIn.push('/api/conversations'), document.querySelector('table.sessions [data-history="proj/agent1"]').click(), true`);
+    await out('/?sso&conv');
+
+    // app.js api(): the board POST behind Seen.
+    await b.navigate(`${base}?sso&seen`);
+    await wait(LOADED);
+    await b.evaluate(`document.querySelector('table.sessions [data-open="proj/agent1"]').click(), true`);
+    await wait('document.querySelector("#inspection [data-seen]")');
+    await b.evaluate(`window.__signIn.push('/api/seen'), document.querySelector('#inspection [data-seen]').click(), true`);
+    await out('/?sso&seen');
+
+    // bus.js fetchRead and fetchApi, on a page whose /api/config has no sso: the link comes from
+    // the 401 itself (F1).
+    await b.navigate(`${base}?read#/inbox`);
+    await wait(LOADED);
+    await b.evaluate(`window.__signIn.push('/api/bus/inbox'), document.querySelector('#refresh').click(), true`);
+    await out('/?read');
+    await b.navigate(`${base}?module`);
+    await wait(LOADED);
+    await b.evaluate(`window.__signIn.push('/api/queue'), location.hash = '#/queue', true`);
+    await out('/?module');
+
+    // Any other 401 is an error: no sign-out, and the polls go on.
+    await b.navigate(`${base}?sso&other`);
+    await wait(LOADED);
+    await b.evaluate(`window.__other.push('/api/board', '/api/bus/inbox', '/api/queue'), document.querySelector('#refresh').click(), true`);
+    await settle();
+    assert.equal(await b.evaluate('document.querySelector("#signed-out").hidden'), true);
+    assert.equal(await b.evaluate('document.body.classList.contains("signed-out")'), false);
+    const n = await reqs();
+    await settle();
+    assert.ok(await reqs() > n, 'the refresh stopped on another 401');
+    assert.equal(await shown('#sign-out'), true);
+  } finally { await done(); }
+});
+
+test('the Sign out form shows only when /api/config says sso, and posts to /auth/logout', { timeout: 120000 }, async () => {
+  const { b, base, wait, shown, done } = await setup();
+  try {
+    await b.navigate(base);
+    await wait(LOADED);
+    await new Promise(r => setTimeout(r, 300));
+    assert.equal(await shown('#sign-out'), false);
+    await b.navigate(`${base}?sso`);
+    await wait(`${LOADED} && !document.querySelector("#sign-out").hidden`);
+    assert.equal(await shown('#sign-out'), true);
+    assert.deepEqual(await b.evaluate('(() => { const f = document.querySelector("#sign-out"); return [f.method, f.getAttribute("action"), f.querySelector("button").textContent, f.querySelector("button").type]; })()'), ['post', '/auth/logout', 'Sign out', 'submit']);
+  } finally { await done(); }
+});
@@ -0,0 +1,589 @@
+// Q175 phase 1 (#1690, design agents/sage/work/q175-sso/DESIGN.md section 9): the Console as an
+// OIDC relying party (--sso). Every provider is the fake OP in helpers/fake-oidc.mjs on loopback;
+// no test reaches a real provider, the live Console or a real config or slot file. The public name
+// is console.example.test, sent only as a Host header to the test's own loopback listener. Each
+// refusal checks the status, that no session cookie was set and that the send stub never ran.
+import { test } from 'node:test';
+import assert from 'node:assert/strict';
+import { request } from 'node:http';
+import { spawn, spawnSync } from 'node:child_process';
+import { chmodSync, mkdirSync, mkdtempSync, rmSync, symlinkSync, writeFileSync } from 'node:fs';
+import { tmpdir } from 'node:os';
+import { join } from 'node:path';
+import { fileURLToPath } from 'node:url';
+import { startServer } from '../src/serve.mjs';
+import { createSso, readSlot, SESSION_COOKIE, LOGIN_COOKIE } from '../src/sso.mjs';
+import { close } from './fixture.mjs';
+import { b64url, ecKey, fakeOidc, jwt, psKey, rsaKey } from './helpers/fake-oidc.mjs';
+
+const HOST = 'console.example.test', ORIGIN = `https://${HOST}`;
+const CLI = fileURLToPath(new URL('../src/cli.mjs', import.meta.url));
+const MSG = JSON.stringify({ to: 'coder', body: 'Please look at row 192.' });
+// Test 19: every log line any test here captured, and every token, code, state, nonce, verifier,
+// client secret and session id any test produced. The last test checks the one against the other.
+const ALL_LINES = [], PRODUCED = new Set();
+
+// node:http, not fetch: fetch can't set Host, Origin or Sec-Fetch-Site.
+function call(port, { method = 'GET', path = '/', headers = {}, body, host = HOST } = {}) {
+  return new Promise((resolve, reject) => {
+    const length = body === undefined ? {} : { 'content-length': Buffer.byteLength(body) };
+    const req = request({ host: '127.0.0.1', port, method, path, headers: { host, ...length, ...headers } }, res => {
+      let text = '';
+      res.on('data', c => (text += c));
+      res.on('end', () => resolve({ status: res.statusCode, headers: res.headers, body: text && (res.headers['content-type'] ?? '').startsWith('application/json') ? JSON.parse(text) : text }));
+    });
+    req.on('error', reject);
+    req.end(body);
+  });
+}
+const setCookies = r => [r.headers['set-cookie'] ?? []].flat();
+const sessionOf = r => setCookies(r).find(c => c.startsWith(`${SESSION_COOKIE}=`) && !c.includes('Max-Age=0'))?.split(';')[0] ?? null;
+const writeHeaders = cookie => ({ ...(cookie ? { cookie } : {}), origin: ORIGIN, 'sec-fetch-site': 'same-origin', 'content-type': 'application/json' });
+
+function providerFor(iss, extra = {}) {
+  return { id: iss.name, issuer: iss.issuer, clientId: iss.clientId, clientSecret: { slot: iss.name }, algs: [...new Set(iss.keys.map(k => k.alg))], subjects: [{ sub: `user-${iss.name}`, name: `person-${iss.name}` }], ...extra };
+}
+
+// A fake OP with `issuers`, createSso over them, and the human listener with a counting send.
+async function setup(t, { issuers = [{ name: 'a' }], provider = {}, before = null, retryFirst = 5000, server = {} } = {}) {
+  const op = await fakeOidc();
+  t.after(() => op.close());
+  const iss = issuers.map(o => op.issuer(o.name, o));
+  for (const i of iss) PRODUCED.add(i.clientSecret);
+  before?.(op, iss);
+  const config = { publicOrigin: ORIGIN, providers: iss.map(i => providerFor(i, provider[i.name] ?? {})) };
+  const lines = [];
+  const log = line => { lines.push(line); ALL_LINES.push(line); };
+  const sso = await createSso(config, { secrets: new Map(iss.map(i => [i.name, i.clientSecret])), fetch: op.fetch, log, retryFirst });
+  t.after(() => sso.close());
+  const sends = [];
+  const bus = Object.fromEntries(['inbox', 'tasks', 'agents', 'trail', 'decisions'].map(v => [v, async () => [{ verb: v }]]));
+  const web = await startServer({ port: 0, board: 'http://127.0.0.1:9', bus, sso, send: async args => { sends.push(args); return { id: 'msg-0001' }; }, log, ...server });
+  t.after(() => close(web));
+  return { op, iss, sso, port: web.address().port, lines, sends, config, bus };
+}
+
+// GET /auth/login; returns the authorize URL and the login cookie (name=value).
+async function begin(env, { provider = null, ret = null, query = null, host = HOST } = {}) {
+  const q = query ?? new URLSearchParams({ ...(provider ? { provider } : {}), ...(ret !== null ? { return: ret } : {}) }).toString();
+  const r = await call(env.port, { path: `/auth/login${q ? `?${q}` : ''}`, host });
+  assert.equal(r.status, 303, `login start: ${r.status} ${r.body}`);
+  const cookie = setCookies(r)[0].split(';')[0];
+  const location = r.headers.location;
+  const params = new URL(location).searchParams;
+  PRODUCED.add(cookie.split('=')[1]);
+  for (const k of ['state', 'nonce', 'code_challenge']) PRODUCED.add(params.get(k));
+  for (const record of env.sso.logins.values()) PRODUCED.add(record.verifier);
+  return { r, cookie, location, params };
+}
+function callback(env, begun, { code, state = begun.params.get('state'), extra = {}, cookie = begun.cookie } = {}) {
+  const q = new URLSearchParams({ ...(code !== undefined ? { code } : {}), state, ...extra });
+  return call(env.port, { path: `/auth/callback?${q}`, headers: cookie ? { cookie } : {} });
+}
+function grant(env, begun, iss, opts = {}) {
+  const g = env.op.grant(iss, begun.location, opts);
+  PRODUCED.add(g.code);
+  PRODUCED.add(g.idToken);
+  return g;
+}
+// A whole sign-in: start, a code at the OP, the callback. Returns the callback answer and the
+// session cookie (name=value) when one was set.
+async function signIn(env, { iss = env.iss[0], ret = null, opts = {} } = {}) {
+  const begun = await begin(env, { provider: env.iss.length > 1 ? iss.name : null, ret });
+  const g = grant(env, begun, iss, opts);
+  const r = await callback(env, begun, { code: g.code });
+  const session = sessionOf(r);
+  if (session) PRODUCED.add(session.split('=')[1]);
+  return { begun, g, r, session };
+}
+function refused(env, r, code) {
+  assert.equal(r.status, 403, `expected 403, got ${r.status}`);
+  assert.equal(sessionOf(r), null, 'a session cookie was set');
+  assert.equal(env.sends.length, 0, 'the send stub ran');
+  assert.ok(setCookies(r).includes(`${LOGIN_COOKIE}=; Path=/; Secure; HttpOnly; SameSite=Lax; Max-Age=0`), 'the login cookie was not expired');
+  if (code) assert.match(env.lines.at(-1), new RegExp(` sso refused code=${code} provider=`), env.lines.at(-1));
+}
+
+test('positive: an RS256 provider signs in and sends one message, and the session reads', async t => {
+  const env = await setup(t);
+  assert.notEqual(env.port, 7332);
+  const { r, session } = await signIn(env, { ret: '/board?x=1' });
+  assert.equal(r.status, 303);
+  assert.equal(r.headers.location, `${ORIGIN}/board?x=1`);
+  assert.ok(session);
+  const send = await call(env.port, { method: 'POST', path: '/api/bus/message', headers: writeHeaders(session), body: MSG });
+  assert.equal(send.status, 200, JSON.stringify(send.body));
+  assert.deepEqual(env.sends, [{ to: 'coder', body: 'Please look at row 192.' }]);
+  assert.match(env.lines.at(-1), / send user="person-a" to="coder" id=msg-0001$/);
+  const read = await call(env.port, { path: '/api/bus/inbox', headers: { cookie: session } });
+  assert.equal(read.status, 200);
+  const config = await call(env.port, { path: '/api/config', headers: { cookie: session } });
+  assert.equal(config.body.sso, true);
+  assert.equal(config.body.send, true);
+});
+
+test('positive: an ES256 provider signs in and sends', async t => {
+  const env = await setup(t, { issuers: [{ name: 'e', keys: [ecKey()] }] });
+  assert.deepEqual(env.config.providers[0].algs, ['ES256']);
+  const { session } = await signIn(env);
+  assert.ok(session);
+  assert.equal((await call(env.port, { method: 'POST', path: '/api/bus/message', headers: writeHeaders(session), body: MSG })).status, 200);
+  assert.equal(env.sends.length, 1);
+});
+
+test('positive: two providers each sign in their own subjects, and one provider\'s subject is unknown to the other', async t => {
+  const env = await setup(t, { issuers: [{ name: 'a' }, { name: 'b', keys: [ecKey()] }] });
+  const list = await call(env.port, { path: '/auth/login?return=%2Fboard' });
+  assert.equal(list.status, 200);
+  assert.match(list.body, /provider=a&#38;return=%2Fboard/);
+  assert.match(list.body, /provider=b&#38;return=%2Fboard/);
+  const [a, b] = env.iss;
+  assert.ok((await signIn(env, { iss: a })).session);
+  assert.ok((await signIn(env, { iss: b })).session);
+  const names = [...env.sso.sessions.values()].map(s => s.name);
+  assert.deepEqual(names, ['person-a', 'person-b']);
+  const cross = await signIn(env, { iss: b, opts: { sub: 'user-a' } });
+  refused({ ...env, sends: [] }, cross.r, 'subject-unknown');
+});
+
+test('1: a forged x-authentik header without a cookie is 401 on the API and a sign-in redirect on a page', async t => {
+  const env = await setup(t);
+  const forged = { 'x-authentik-username': 'jason.woltje', origin: ORIGIN, 'sec-fetch-site': 'same-origin', 'content-type': 'application/json' };
+  for (const [method, path, body] of [['POST', '/api/bus/message', MSG], ['POST', '/api/settings', '{}'], ['GET', '/api/config', undefined]]) {
+    const r = await call(env.port, { method, path, headers: forged, body });
+    assert.equal(r.status, 401, `${method} ${path}`);
+    assert.deepEqual(r.body, { error: 'sign-in required' });
+  }
+  const page = await call(env.port, { path: '/', headers: forged });
+  assert.equal(page.status, 303);
+  assert.equal(page.headers.location, '/auth/login?return=%2F');
+  const deep = await call(env.port, { path: '/board?x=1' });
+  assert.equal(deep.headers.location, '/auth/login?return=%2Fboard%3Fx%3D1');
+  assert.equal(env.sends.length, 0);
+});
+
+test('2: an HS256 ID token keyed with the client secret and a real RSA kid is refused', async t => {
+  const env = await setup(t);
+  const [iss] = env.iss;
+  const { r } = await signIn(env, { opts: { header: { alg: 'HS256', kid: iss.keys[0].kid } } });
+  refused(env, r, 'id-token-invalid');
+});
+
+test('3: a wrong aud, and an aud list holding another client with no azp, are refused', async t => {
+  const env = await setup(t);
+  refused(env, (await signIn(env, { opts: { claims: { aud: 'another-client' } } })).r, 'id-token-invalid');
+  refused(env, (await signIn(env, { opts: { claims: { aud: [env.iss[0].clientId, 'another-client'] } } })).r, 'id-token-invalid');
+});
+
+test('4: a token that expired 10 minutes ago is refused', async t => {
+  const env = await setup(t);
+  const now = Math.floor(Date.now() / 1000);
+  refused(env, (await signIn(env, { opts: { claims: { iat: now - 900, exp: now - 600 } } })).r, 'id-token-invalid');
+});
+
+test('5: another issuer, and the issuer without its trailing slash, are refused', async t => {
+  const env = await setup(t);
+  const [iss] = env.iss;
+  refused(env, (await signIn(env, { opts: { claims: { iss: `${env.op.base}/other/` } } })).r, 'id-token-invalid');
+  refused(env, (await signIn(env, { opts: { claims: { iss: iss.issuer.slice(0, -1) } } })).r, 'id-token-invalid');
+});
+
+test('6: a nonce mismatch and a missing nonce are refused', async t => {
+  const env = await setup(t);
+  refused(env, (await signIn(env, { opts: { claims: { nonce: 'not-the-nonce' } } })).r, 'id-token-invalid');
+  refused(env, (await signIn(env, { opts: { claims: { nonce: undefined } } })).r, 'id-token-invalid');
+});
+
+test('7: state mismatch, no login cookie, a replay, an expired record and two login cookies are refused', async t => {
+  const env = await setup(t);
+  const [iss] = env.iss;
+  let begun = await begin(env);
+  refused(env, await callback(env, begun, { code: grant(env, begun, iss).code, state: 'wrong-state' }), 'state-mismatch');
+  begun = await begin(env);
+  refused(env, await callback(env, begun, { code: grant(env, begun, iss).code, cookie: null }), 'login-record-missing');
+  // Replay: the OP takes the code twice, so only the take-and-delete rule refuses the second callback.
+  iss.acceptTwice = true;
+  begun = await begin(env);
+  const g = grant(env, begun, iss);
+  const first = await callback(env, begun, { code: g.code });
+  assert.equal(first.status, 303);
+  PRODUCED.add(sessionOf(first).split('=')[1]);
+  refused(env, await callback(env, begun, { code: g.code }), 'login-record-missing');
+  iss.acceptTwice = false;
+  begun = await begin(env);
+  for (const record of env.sso.logins.values()) record.expires = Date.now() - 1;
+  refused(env, await callback(env, begun, { code: grant(env, begun, iss).code }), 'login-record-missing');
+  begun = await begin(env);
+  const other = await begin(env);
+  refused(env, await callback(env, begun, { code: grant(env, begun, iss).code, cookie: `${begun.cookie}; ${other.cookie}` }), 'login-record-missing');
+});
+
+test('8: the token request carries the PKCE verifier, and the OP refuses a wrong one', async t => {
+  const env = await setup(t);
+  const [iss] = env.iss;
+  const { r, begun } = await signIn(env);
+  assert.equal(r.status, 303);
+  const { form } = iss.tokenRequests.at(-1);
+  assert.equal(begun.params.get('code_challenge_method'), 'S256');
+  const { createHash } = await import('node:crypto');
+  assert.equal(createHash('sha256').update(form.code_verifier).digest('base64url'), begun.params.get('code_challenge'));
+  refused(env, (await signIn(env, { opts: { challenge: 'not-the-challenge' } })).r, 'grant-failed');
+});
+
+test('9: alg none, a changed payload under a real kid, and an unknown kid even after the refetch are refused', async t => {
+  const env = await setup(t);
+  const [iss] = env.iss;
+  // (a) alg none: the alg rule, before any signature check.
+  refused(env, (await signIn(env, { opts: { header: { alg: 'none' } } })).r, 'id-token-invalid');
+  // (b) a real kid's signature over another payload: only the signature check catches it.
+  let begun = await begin(env);
+  const real = env.op.grant(iss, begun.location);
+  PRODUCED.add(real.idToken);
+  const [h, , s] = real.idToken.split('.');
+  const forged = `${h}.${b64url({ ...real.payload, name: 'changed' })}.${s}`;
+  refused(env, await callback(env, begun, { code: grant(env, begun, iss, { idToken: forged }).code }), 'signature-invalid');
+  // (c) a key the JWKS never held, again after the cache is old enough to refetch.
+  t.mock.timers.enable({ apis: ['Date'], now: Date.now() });
+  const stranger = rsaKey('not-in-jwks');
+  refused(env, (await signIn(env, { opts: { key: stranger } })).r, 'signature-invalid');
+  const fetches = iss.jwksFetches;
+  t.mock.timers.tick(61000);
+  refused(env, (await signIn(env, { opts: { key: stranger } })).r, 'signature-invalid');
+  assert.equal(iss.jwksFetches, fetches + 1, 'no refetch');
+});
+
+test('10: a valid token for a subject not configured is 403 with one subject-unknown line', async t => {
+  const env = await setup(t);
+  const before = env.lines.length;
+  const { r } = await signIn(env, { opts: { sub: 'stranger' } });
+  refused(env, r, 'subject-unknown');
+  const added = env.lines.slice(before);
+  assert.equal(added.length, 1);
+  assert.match(added[0], new RegExp(`^\\S+ sso refused code=subject-unknown provider=a iss=${JSON.stringify(env.iss[0].issuer).replace(/[.*+?^${}()|[\]\\/]/g, '\\$&')} sub="stranger"$`));
+});
+
+test('11: start refusals: HS or none algs, reserved names, HS-only discovery, an empty JWKS, no S256, an issuer mismatch, a short RSA key', async t => {
+  const op = await fakeOidc();
+  t.after(() => op.close());
+  const start = (iss, extra = {}) => createSso({ publicOrigin: ORIGIN, providers: [providerFor(iss, extra)] }, { secrets: new Map([[iss.name, iss.clientSecret]]), fetch: op.fetch, log: l => ALL_LINES.push(l) });
+  const a = op.issuer('a');
+  PRODUCED.add(a.clientSecret);
+  for (const [extra, why] of [
+    [{ algs: ['HS256'] }, /algs\[0\] must be one of .*HS\* and none are refused/],
+    [{ algs: ['none'] }, /algs\[0\] must be one of/],
+    [{ subjects: [{ sub: 'u', name: 'tester' }] }, /subjects\[0\]\.name must not be tester or human/],
+    [{ subjects: [{ sub: 'u', name: 'Human' }] }, /subjects\[0\]\.name must not be tester or human/],
+  ]) await assert.rejects(start(a, extra), why);
+  const refusedAtDiscovery = /console\.sso provider \w+ refused at discovery/;
+  // The mosaic-preview shape: HS256 only.
+  const hs = op.issuer('hs', { discovery: { id_token_signing_alg_values_supported: ['HS256'] } });
+  await assert.rejects(start(hs, { algs: ['RS256'] }), refusedAtDiscovery);
+  const empty = op.issuer('empty');
+  empty.jwksOverride = { keys: [] };
+  await assert.rejects(start(empty), refusedAtDiscovery);
+  const plain = op.issuer('plain', { discovery: { code_challenge_methods_supported: ['plain'] } });
+  await assert.rejects(start(plain), refusedAtDiscovery);
+  const moved = op.issuer('moved');
+  moved.discovery = { issuer: `${op.base}/elsewhere/` };
+  await assert.rejects(start(moved), refusedAtDiscovery);
+  const small = op.issuer('small', { keys: [rsaKey('small', 1024)] });
+  await assert.rejects(start(small), refusedAtDiscovery);
+  // The control: the same OP and provider start.
+  const sso = await start(a);
+  assert.deepEqual(sso.health(), { a: 'ready' });
+  sso.close();
+  await assert.rejects(startServer({ port: 0, sso, preview: { host: HOST, header: 'remote-user', user: 'jason' } }), /--sso cannot be combined/);
+});
+
+test('11: slot files: a symlink, mode 0644, mode 0640 and a file under the repository are refused, and no message holds the value', t => {
+  const root = mkdtempSync(join(tmpdir(), 'webui-sso-slot-'));
+  t.after(() => rmSync(root, { recursive: true, force: true }));
+  const dir = join(root, 'config'), slots = join(dir, 'secrets', 'mosaic-stack');
+  mkdirSync(slots, { recursive: true });
+  const provider = slot => ({ id: 'a', clientSecret: { slot } });
+  const value = 'slot-value-do-not-print';
+  const opts = { repo: join(root, 'repo'), copies: join(root, 'copies') };
+  writeFileSync(join(slots, 'good'), `${value}\n`, { mode: 0o600 });
+  assert.equal(readSlot(dir, provider('good'), opts), value);
+  writeFileSync(join(root, 'target'), value, { mode: 0o600 });
+  symlinkSync(join(root, 'target'), join(slots, 'link'));
+  for (const [slot, mode] of [['wide', 0o644], ['group', 0o640]]) { writeFileSync(join(slots, slot), value); chmodSync(join(slots, slot), mode); }
+  writeFileSync(join(slots, 'two'), `${value}\nmore\n`, { mode: 0o600 });
+  writeFileSync(join(slots, 'empty'), '\n', { mode: 0o600 });
+  const cases = [
+    ['missing', /slot is missing$/, opts],
+    ['link', /must not be a symbolic link$/, opts],
+    ['wide', /must have no group or other permission bits$/, opts],
+    ['group', /must have no group or other permission bits$/, opts],
+    ['two', /must hold one non-empty line$/, opts],
+    ['empty', /must hold one non-empty line$/, opts],
+    // The config dir itself under the repository, and under a --checkout.
+    ['good', /must not be inside the repository or a stack copy$/, { ...opts, repo: root }],
+    ['good', /must not be inside the repository or a stack copy$/, { ...opts, checkout: dir }],
+    ['good', /must not be inside the repository or a stack copy$/, { ...opts, copies: dir }],
+  ];
+  for (const [slot, why, o] of cases) {
+    let err = null;
+    try { readSlot(dir, provider(slot), o); } catch (e) { err = e; }
+    assert.ok(err, `${slot} was read`);
+    assert.match(err.message, /^console\.sso provider a client secret slot /);
+    assert.match(err.message, why, slot);
+    assert.equal(err.message.includes(value), false);
+    assert.equal(err.message.includes(root), false);
+  }
+});
+
+test('11: the CLI refuses --sso with the old flags and without console.sso, and starts with a good one', async t => {
+  const root = mkdtempSync(join(tmpdir(), 'wsso-'));
+  t.after(() => rmSync(root, { recursive: true, force: true }));
+  const env = { ...process.env, MOSAIC_CONFIG: join(root, 'cfg', 'config.json'), XDG_DATA_HOME: join(root, 'xdg') };
+  for (const flags of [['--auth-header', 'remote-user'], ['--public-host', HOST], ['--allow-user', 'jason'], ['--proof-header', 'x-proof']]) {
+    const r = spawnSync(process.execPath, [CLI, 'serve', '--port', '0', '--sso', ...flags], { encoding: 'utf8', timeout: 10000, env });
+    assert.equal(r.status, 2, flags.join(' '));
+    assert.match(r.stderr, /^refused: --sso cannot be combined with --public-host, --auth-header, --allow-user or --proof-\*$/m);
+  }
+  const missing = spawnSync(process.execPath, [CLI, 'serve', '--port', '0', '--sso'], { encoding: 'utf8', timeout: 10000, env });
+  assert.equal(missing.status, 2);
+  assert.match(missing.stderr, /^refused: --sso needs the system config \(/);
+  const op = await fakeOidc();
+  t.after(() => op.close());
+  const a = op.issuer('a');
+  PRODUCED.add(a.clientSecret);
+  mkdirSync(join(root, 'cfg', 'secrets', 'mosaic-stack'), { recursive: true });
+  writeFileSync(join(root, 'ca.pem'), op.cert);
+  const base = { configVersion: 1, environment: 'development', dataRoot: join(root, 'data'), execution: { backend: 'docker', provider: 'zai', model: 'm' } };
+  writeFileSync(env.MOSAIC_CONFIG, JSON.stringify(base));
+  const noKey = spawnSync(process.execPath, [CLI, 'serve', '--port', '0', '--sso'], { encoding: 'utf8', timeout: 10000, env });
+  assert.equal(noKey.status, 2);
+  assert.match(noKey.stderr, /^refused: --sso needs console\.sso in the system config$/m);
+  writeFileSync(env.MOSAIC_CONFIG, JSON.stringify({ ...base, console: { sso: { publicOrigin: ORIGIN, providers: [providerFor(a)] } } }));
+  writeFileSync(join(root, 'cfg', 'secrets', 'mosaic-stack', 'a'), `${a.clientSecret}\n`, { mode: 0o644 });
+  const wide = spawnSync(process.execPath, [CLI, 'serve', '--port', '0', '--sso'], { encoding: 'utf8', timeout: 10000, env });
+  assert.equal(wide.status, 2);
+  assert.match(wide.stderr, /^refused: console\.sso provider a client secret slot must have no group or other permission bits$/m);
+  chmodSync(join(root, 'cfg', 'secrets', 'mosaic-stack', 'a'), 0o600);
+  // The child trusts the fake OP's certificate through NODE_EXTRA_CA_CERTS; the code under test has no flag for it.
+  const child = spawn(process.execPath, [CLI, 'serve', '--port', '0', '--sso'], { env: { ...env, NODE_EXTRA_CA_CERTS: join(root, 'ca.pem') } });
+  t.after(() => child.kill('SIGKILL'));
+  let out = '', err = '';
+  child.stderr.on('data', c => (err += c));
+  await new Promise((resolve, reject) => {
+    const timer = setTimeout(() => reject(new Error(`no start line: ${out} ${err}`)), 15000);
+    child.stdout.on('data', c => { out += c; if (out.includes('Ctrl-C')) { clearTimeout(timer); resolve(); } });
+    child.on('exit', () => { clearTimeout(timer); reject(new Error(`exited: ${err}`)); });
+  });
+  assert.match(out, new RegExp(`^Sign-in: ${ORIGIN}/ \\(--sso\\), read-only$`, 'm'));
+  assert.match(out, new RegExp(`^Sign-in provider: a issuer ${a.issuer.replace(/[.]/g, '\\.')} subjects 1 \\(ready\\)$`, 'm'));
+  assert.equal(out.includes(a.clientSecret) || err.includes(a.clientSecret), false);
+  assert.equal(out.includes(a.clientId), false);
+  const port = Number(out.match(/^Mosaic Console: http:\/\/127\.0\.0\.1:(\d+)\//m)[1]);
+  const health = await call(port, { path: '/healthz', host: `127.0.0.1:${port}` });
+  assert.deepEqual(health.body, { ok: true, sso: { a: 'ready' } });
+  child.kill('SIGTERM');
+});
+
+test('12: under --sso the tester listener refuses each kind of sign-in, has no /auth, and startServer refuses tester with sso', async t => {
+  const env = await setup(t);
+  const tester = await startServer({ port: 0, board: 'http://127.0.0.1:9', bus: env.bus, tester: true, testerNoSignIn: true, log: () => {} });
+  t.after(() => close(tester));
+  const port = tester.address().port, host = `127.0.0.1:${port}`;
+  const { session, g, begun } = await signIn(env);
+  assert.ok(session);
+  const plain = await call(port, { path: '/api/config', host });
+  assert.equal(plain.status, 200, 'control: a request with no sign-in is served');
+  for (const headers of [
+    { cookie: session },
+    { cookie: `theme=dark; ${begun.cookie}` },
+    { cookie: `${SESSION_COOKIE.toLowerCase()}=x` },
+    { authorization: `Bearer ${g.idToken}` },
+    { 'x-authentik-jwt': g.idToken },
+    { 'X-Authentik-Username': 'jason.woltje' },
+  ]) {
+    const r = await call(port, { path: '/api/config', host, headers });
+    assert.equal(r.status, 403, JSON.stringify(Object.keys(headers)));
+    assert.deepEqual(r.body, { error: 'tester listener takes no sign-in' });
+  }
+  assert.equal((await call(port, { path: '/auth/login', host })).status, 404);
+  await assert.rejects(startServer({ port: 0, tester: true, sso: env.sso }), /tester listener cannot use sso/);
+});
+
+test('13: idle and absolute expiry, logout then reuse, a cross-origin logout, and background reads that don\'t keep a session', async t => {
+  const env = await setup(t);
+  const read = cookie => call(env.port, { path: '/api/bus/inbox', headers: { cookie } });
+  const record = () => [...env.sso.sessions.values()].at(-1);
+  // Background reads don't move `seen`; a page load does.
+  let { session } = await signIn(env);
+  const old = Date.now() - 59 * 60 * 1000;
+  record().seen = old;
+  assert.equal((await read(session)).status, 200);
+  assert.equal(record().seen, old, 'a background read refreshed the session');
+  assert.equal((await call(env.port, { path: '/', headers: { cookie: session } })).status, 200);
+  assert.ok(record().seen > old, 'a page load did not refresh the session');
+  // Idle: 59 minutes of background reads, then one more past the hour.
+  record().seen = Date.now() - 61 * 60 * 1000;
+  assert.equal((await read(session)).status, 401);
+  // Absolute.
+  ({ session } = await signIn(env));
+  record().created = Date.now() - 8 * 3600 * 1000;
+  assert.equal((await call(env.port, { path: '/', headers: { cookie: session } })).headers.location, '/auth/login?return=%2F');
+  // Logout needs same-origin; refused, the session stays.
+  ({ session } = await signIn(env));
+  const cross = await call(env.port, { method: 'POST', path: '/auth/logout', headers: { cookie: session, origin: ORIGIN, 'sec-fetch-site': 'cross-site' } });
+  assert.equal(cross.status, 403);
+  assert.equal((await read(session)).status, 200);
+  const noOrigin = await call(env.port, { method: 'POST', path: '/auth/logout', headers: { cookie: session, 'sec-fetch-site': 'same-origin' } });
+  assert.equal(noOrigin.status, 403);
+  assert.equal((await read(session)).status, 200);
+  const out = await call(env.port, { method: 'POST', path: '/auth/logout', headers: { cookie: session, origin: ORIGIN, 'sec-fetch-site': 'same-origin' } });
+  assert.equal(out.status, 303);
+  const end = new URL(out.headers.location);
+  assert.equal(`${end.origin}${end.pathname}`, `${env.iss[0].issuer}end-session`);
+  assert.equal(end.searchParams.get('post_logout_redirect_uri'), `${ORIGIN}/auth/signed-out`);
+  assert.equal(end.searchParams.get('client_id'), env.iss[0].clientId);
+  assert.ok(end.searchParams.get('id_token_hint'));
+  assert.deepEqual(setCookies(out), [`${SESSION_COOKIE}=; Path=/; Secure; HttpOnly; SameSite=Lax; Max-Age=0`]);
+  assert.equal((await read(session)).status, 401);
+  assert.equal((await call(env.port, { method: 'GET', path: '/auth/logout', headers: { cookie: session } })).status, 405);
+});
+
+test('13: the CSP lets the Sign out form reach the provider\'s end-session origin, and only under --sso', async t => {
+  const env = await setup(t);
+  const r = await call(env.port, { path: '/healthz', host: `127.0.0.1:${env.port}` });
+  assert.match(r.headers['content-security-policy'], new RegExp(`; form-action 'self' ${env.op.base.replace(/[.]/g, '\\.')}$`));
+  const plain = await startServer({ port: 0, board: 'http://127.0.0.1:9' });
+  t.after(() => close(plain));
+  const p = await call(plain.address().port, { path: '/healthz', host: `127.0.0.1:${plain.address().port}` });
+  assert.match(p.headers['content-security-policy'], /; form-action 'self'$/);
+});
+
+test('14: open redirects land on /, and a path on the Console lands there', async t => {
+  const env = await setup(t);
+  for (const [query, where] of [
+    ['return=%2F%2Fevil.example', `${ORIGIN}/`],
+    ['return=https%3A%2F%2Fevil.example', `${ORIGIN}/`],
+    ['return=%2F%5Cevil.example', `${ORIGIN}/`],
+    ['return=/%09/evil.example', `${ORIGIN}/`],
+    // Dot segments that leave a pathname of //evil.example stay on the Console (webby-0019 B1).
+    ['return=%2F.%2F%2Fevil.example', `${ORIGIN}//evil.example`],
+    ['return=%2Fx%2F..%2F%2Fevil.example', `${ORIGIN}//evil.example`],
+    [`return=${encodeURIComponent(`${ORIGIN}//evil.example`)}`, `${ORIGIN}//evil.example`],
+    ['return=%2Fboard%2F.%2Fx', `${ORIGIN}/board/x`],
+    ['return=%2Fboard%3Fx%3D1', `${ORIGIN}/board?x=1`],
+    ['', `${ORIGIN}/`],
+  ]) {
+    const begun = await begin(env, { query });
+    const r = await callback(env, begun, { code: grant(env, begun, env.iss[0]).code });
+    assert.equal(r.status, 303);
+    assert.equal(r.headers.location, where, query);
+    assert.equal(new URL(r.headers.location).origin, ORIGIN, query);
+    PRODUCED.add(sessionOf(r).split('=')[1]);
+  }
+});
+
+test('15: a callback for A carrying B\'s code and iss, and a provider= query, is refused', async t => {
+  const env = await setup(t, { issuers: [{ name: 'a' }, { name: 'b' }] });
+  const [, b] = env.iss;
+  for (const extra of [{ iss: b.issuer, provider: 'b' }, { provider: 'b' }]) {
+    const begun = await begin(env, { provider: 'a' });
+    // B's code against A's PKCE challenge and nonce, for B's own subject: only the record rule
+    // (this callback belongs to A) stands in the way.
+    const g = grant(env, begun, b, { sub: 'user-b' });
+    const r = await callback(env, begun, { code: g.code, extra });
+    refused(env, r);
+  }
+  assert.equal(b.tokenRequests.length, 0, 'B\'s token endpoint was called');
+});
+
+test('16: a provider with RS256 and ES256 takes either, and refuses PS256 with a usable PS256 key in the JWKS', async t => {
+  const rsa = rsaKey(), ec = ecKey(), ps = psKey();
+  const env = await setup(t, { issuers: [{ name: 'a', keys: [rsa, ec, ps] }], provider: { a: { algs: ['RS256', 'ES256'] } } });
+  assert.ok((await signIn(env, { opts: { key: rsa } })).session);
+  assert.ok((await signIn(env, { opts: { key: ec } })).session);
+  refused(env, (await signIn(env, { opts: { key: ps } })).r, 'id-token-invalid');
+});
+
+test('17: 33 started logins leave 32 records, and the first one\'s callback finds none', async t => {
+  const env = await setup(t);
+  const first = await begin(env);
+  for (let i = 0; i < 32; i++) await begin(env);
+  assert.equal(env.sso.logins.size, 32);
+  refused(env, await callback(env, first, { code: grant(env, first, env.iss[0]).code }), 'login-record-missing');
+});
+
+test('18: after a key rotation a sign-in works through one refetch, and the removed kid is refused', async t => {
+  const env = await setup(t);
+  const [iss] = env.iss;
+  t.mock.timers.enable({ apis: ['Date'], now: Date.now() });
+  const old = iss.keys[0];
+  assert.ok((await signIn(env)).session);
+  const fetches = iss.jwksFetches;
+  env.op.rotate(iss);
+  t.mock.timers.tick(61000);
+  assert.ok((await signIn(env)).session);
+  assert.equal(iss.jwksFetches, fetches + 1);
+  refused(env, (await signIn(env, { opts: { key: old } })).r, 'signature-invalid');
+});
+
+test('20 and 21: the store holds no raw session id, and the cookie strings are exact', async t => {
+  const env = await setup(t);
+  const begun = await begin(env);
+  assert.match(setCookies(begun.r)[0], new RegExp(`^${LOGIN_COOKIE}=[A-Za-z0-9_-]{43}; Path=/; Secure; HttpOnly; SameSite=Lax; Max-Age=600$`));
+  for (const key of env.sso.logins.keys()) assert.match(key, /^[0-9a-f]{64}$/);
+  const r = await callback(env, begun, { code: grant(env, begun, env.iss[0]).code });
+  const set = setCookies(r);
+  assert.equal(set.length, 2);
+  assert.equal(set[0], `${LOGIN_COOKIE}=; Path=/; Secure; HttpOnly; SameSite=Lax; Max-Age=0`);
+  assert.match(set[1], new RegExp(`^${SESSION_COOKIE}=[A-Za-z0-9_-]{43}; Path=/; Secure; HttpOnly; SameSite=Lax$`));
+  const id = set[1].split(';')[0].split('=')[1];
+  PRODUCED.add(id);
+  for (const [key, value] of env.sso.sessions) {
+    assert.match(key, /^[0-9a-f]{64}$/);
+    assert.notEqual(key, id);
+    assert.equal(JSON.stringify(value).includes(id), false);
+  }
+});
+
+test('22: a loopback Host is 403 on a page, a read and a write; /healthz on loopback is 200; a redirect_uri never comes from the Host', async t => {
+  const env = await setup(t);
+  const { session } = await signIn(env);
+  const loop = `127.0.0.1:${env.port}`;
+  for (const [method, path, body] of [['GET', '/', undefined], ['GET', '/api/board', undefined], ['GET', '/api/bus/inbox', undefined], ['POST', '/api/bus/message', MSG]]) {
+    // A loopback Host on this listener's port; any other Host is already the older non-local refusal.
+    for (const host of [loop, `localhost:${env.port}`]) {
+      const r = await call(env.port, { method, path, host, body, headers: { cookie: session, 'content-type': 'application/json' } });
+      assert.equal(r.status, 403, `${method} ${path} ${host}`);
+      assert.deepEqual(r.body, { error: 'public Host required' });
+    }
+  }
+  const health = await call(env.port, { path: '/healthz', host: loop });
+  assert.equal(health.status, 200);
+  assert.deepEqual(health.body, { ok: true, sso: { a: 'ready' } });
+  assert.equal(env.sends.length, 0);
+  const begun = await begin(env, { host: HOST.toUpperCase() });
+  assert.equal(begun.params.get('redirect_uri'), `${ORIGIN}/auth/callback`);
+});
+
+test('23: a provider down at start leaves the Console up and 503, and the retry makes sign-in work', async t => {
+  let env = await setup(t, { retryFirst: 50, before: (op, [a]) => { a.mode = 'down'; } });
+  assert.equal((await call(env.port, { path: '/auth/login' })).status, 503);
+  assert.deepEqual((await call(env.port, { path: '/healthz', host: `127.0.0.1:${env.port}` })).body.sso, { a: 'unreachable' });
+  assert.match(env.lines.at(-1), / sso refused code=discovery-failed provider=a$/);
+  env.iss[0].mode = 'ok';
+  for (let i = 0; i < 100 && env.sso.health().a !== 'ready'; i++) await new Promise(r => setTimeout(r, 20));
+  assert.deepEqual(env.sso.health(), { a: 'ready' });
+  assert.ok((await signIn(env)).session);
+  // A 200 HTML page at the discovery URL is unreachable too, and the Console starts.
+  env = await setup(t, { before: (op, [a]) => { a.mode = 'html'; } });
+  assert.deepEqual(env.sso.health(), { a: 'unreachable' });
+  // HS-only discovery at start refuses the start.
+  await assert.rejects(setup(t, { before: (op, [a]) => { a.discovery = { id_token_signing_alg_values_supported: ['HS256'] }; } }), /refused at discovery/);
+});
+
+test('19: no captured log line holds a token, code, state, nonce, verifier, client secret or session id', () => {
+  assert.ok(ALL_LINES.length > 20, `only ${ALL_LINES.length} lines`);
+  assert.ok(PRODUCED.size > 50, `only ${PRODUCED.size} values`);
+  for (const line of ALL_LINES) {
+    for (const value of PRODUCED) if (value) assert.equal(line.includes(value), false, `a log line holds a produced value: ${line.slice(0, 80)}`);
+    assert.match(line, /^\S+ (sso refused code=[a-z-]+ provider=[a-z0-9-]+( iss="[^"]*" sub="[^"]*")?|send user="[^"]+" to="[^"]*" (id=msg-0001|error=[a-z -]+))$/, line);
+  }
+});
@@ -26,6 +26,7 @@ import fs from "node:fs";
 import os from "node:os";
 import path from "node:path";
 import process from "node:process";
+import { pathToFileURL } from "node:url";

 const SUPPORTED_CONFIG_VERSION = 1;
 const SUPPORTED_ENVIRONMENTS = new Set(["development", "production"]);
@@ -106,13 +107,30 @@ function isAncestorOf(ancestor, candidate) {
  return rel !== "" && !rel.startsWith("..") && !path.isAbsolute(rel);
 }

-function validate(document, file) {
+// Q175 phase 1 (#1690): the optional `console` key, checked for shape only by the Console's own
+// checker. It is imported only when the key is there, so a config without it never needs the
+// Console's code, and a copy of this file alone still reads one.
+async function validateConsole(value) {
+  let checkConsole;
+  try {
+    ({ checkConsole } = await import(pathToFileURL(path.join(import.meta.dirname, "..", "packages", "webui", "src", "sso-config.mjs")).href));
+  } catch {
+    fail(2, 'the "console" key needs packages/webui/src/sso-config.mjs beside this loader');
+  }
+  try {
+    return checkConsole(value);
+  } catch (error) {
+    fail(2, error.message);
+  }
+}
+
+async function validate(document, file) {
  if (!isPlainObject(document)) {
    fail(2, "configuration must be a JSON object");
  }
  rejectUnknownKeys(
    document,
-    ["configVersion", "environment", "dataRoot", "execution"],
+    ["configVersion", "environment", "dataRoot", "execution", "console"],
    "configuration",
  );

@@ -146,6 +164,10 @@ function validate(document, file) {
    fail(2, `unsupported execution.adapter: ${JSON.stringify(adapter)} (supported: ${[...SUPPORTED_ADAPTERS].join(", ")})`);
  }

+  // Last, so the older checks keep their order. The key is in the output only when the file has
+  // it, so a config without it prints what it always printed.
+  const consoleKey = Object.hasOwn(document, "console") ? await validateConsole(document.console) : undefined;
+
  return {
    configVersion: document.configVersion,
    environment: document.environment,
@@ -156,10 +178,11 @@ function validate(document, file) {
      model: document.execution.model,
      adapter,
    },
+    ...(consoleKey === undefined ? {} : { console: consoleKey }),
  };
 }

-function load(file) {
+async function load(file) {
  const raw = readRaw(file);
  if (raw === null) {
    fail(3, `configuration not found: ${file} (run scripts/bootstrap.sh to create it)`);
@@ -170,7 +193,7 @@ function load(file) {
  } catch (error) {
    fail(2, `configuration is not valid JSON (${file}): ${error.message}`);
  }
-  return validate(document, file);
+  return await validate(document, file);
 }

 function shellQuote(value) {
@@ -194,7 +217,7 @@ const file = configPath();
 switch (operation) {
  case "bootstrap": {
    if (fs.existsSync(file)) {
-      load(file); // validate only; never rewrite
+      await load(file); // validate only; never rewrite
      process.stderr.write(`mosaic-config: configuration already present, validated without changes: ${file}\n`);
      process.exit(0);
    }
@@ -206,26 +229,26 @@ switch (operation) {
      fs.writeFileSync(fd, `${JSON.stringify(DEFAULT_CONFIG, null, 2)}\n`);
    } catch (error) {
      if (error.code === "EEXIST") {
-        load(file);
+        await load(file);
        process.exit(0);
      }
      fail(1, `unable to create configuration: ${error.message}`);
    } finally {
      if (fd !== undefined) fs.closeSync(fd);
    }
-    load(file);
+    await load(file);
    process.stderr.write(`mosaic-config: created default configuration: ${file}\n`);
    process.exit(0);
  }

  case "validate": {
-    const resolved = load(file);
+    const resolved = await load(file);
    process.stdout.write(`${JSON.stringify(resolved, null, 2)}\n`);
    process.exit(0);
  }

  case "env": {
-    const resolved = load(file);
+    const resolved = await load(file);
    process.stdout.write(
      [
        `MOSAIC_DATA_ROOT=${shellQuote(resolved.dataRoot)}`,
@@ -3,7 +3,8 @@
 # Moves the bus, the Console and the human CLI from the pointer's copy to another copy together,
 # behind a health gate, and puts the old stack back inside the same run when the gate fails.
 # Console tester listener flags follow target support (row 176, #1674); so does the row 178 proof
-# pair, which activate sets or drops (row 187, #1685).
+# pair, which activate sets or drops (row 187, #1685). activate --no-send drops --send (row 189, #1687).
+# activate --sso swaps the preview set and the pair for the Console's own sign-in (row 200, #1698).
 # Design and tests: agents/darkwing/work/queue-162/BUILD.md.
 #
 # Who runs it. Decision 96 (Mos, mos-0716) lets this script stop and start the live units under
@@ -30,13 +31,13 @@ BIN="$HOME/.npm-global/bin"
 UNIT_DIR="${XDG_CONFIG_HOME:-$HOME/.config}/systemd/user"
 CONSOLE_UNIT=mosaic-webui.service
 TIMEOUT=60 WANT_PM=0 AFTER_HARNESS=0 MIGRATE=0 PLAN=0 RESTORE="" EVENTS="" TESTER_PORT=""
-PROOF_HEADER="" PROOF_FILE="" NO_PROOF=0 R_BACKUP="" R_PORT=""
+PROOF_HEADER="" PROOF_FILE="" NO_PROOF=0 NO_SEND=0 SSO=0 R_BACKUP="" R_PORT=""

 usage() {
    cat >&2 <<'USAGE'
 usage: stack-release.sh adopt BUSINESS
       stack-release.sh activate ID BUSINESS [--pm | --pm-after-harness] [--migrate] [--tester-port N]
-           [--proof-header NAME --proof-file PATH | --no-proof] [--timeout S] [--plan]
+           [--proof-header NAME --proof-file PATH | --no-proof | --sso] [--no-send] [--timeout S] [--plan]
       stack-release.sh pm-on BUSINESS [--timeout S]
       stack-release.sh rollback BUSINESS [--restore ACTIVATION [--events N]] [--timeout S] [--plan]
       stack-release.sh status BUSINESS
@@ -85,6 +86,8 @@ parse_opts() {
            --proof-header) [ "$OP" = activate ] && [ $# -ge 2 ] && [ -n "$2" ] || usage; PROOF_HEADER="$2"; shift 2 ;;
            --proof-file) [ "$OP" = activate ] && [ $# -ge 2 ] && [ -n "$2" ] || usage; PROOF_FILE="$2"; shift 2 ;;
            --no-proof) [ "$OP" = activate ] || usage; NO_PROOF=1; shift ;;
+            --no-send) [ "$OP" = activate ] || usage; NO_SEND=1; shift ;;
+            --sso) [ "$OP" = activate ] || usage; SSO=1; shift ;;
            --migrate) [ "$OP" = activate ] || usage; MIGRATE=1; shift ;;
            --restore) [ "$OP" = rollback ] && [ $# -ge 2 ] && [[ "$2" =~ ^[0-9]{8}T[0-9]{6}Z-[0-9a-f]{12}(-[1-9])?$ ]] || usage; RESTORE="$2"; shift 2 ;;
            --backup) [ "$OP" = rehearse ] && [ $# -ge 2 ] && { [[ "$2" =~ ^[0-9]{8}T[0-9]{6}Z-[0-9a-f]{12}(-[1-9])?$ ]] || [[ "$2" =~ ^/[A-Za-z0-9/._+-]*$ ]]; } || usage; R_BACKUP="$2"; shift 2 ;;
@@ -102,6 +105,8 @@ parse_opts() {
    # The proof pair goes together, and --no-proof goes alone (row 187).
    [ "${PROOF_HEADER:+1}" = "${PROOF_FILE:+1}" ] || usage
    [ "$NO_PROOF" = 0 ] || [ -z "$PROOF_HEADER" ] || usage
+    # --sso drops the pair itself, so it takes neither a pair nor --no-proof (row 200).
+    [ "$SSO" = 0 ] || { [ -z "$PROOF_HEADER" ] && [ "$NO_PROOF" = 0 ]; } || usage
    local d
    for d in "$COPIES" "$BIN"; do
        case "$d" in /*) ;; *) usage ;; esac
@@ -157,7 +162,9 @@ for(const k of open.keys())process.stdout.write(k+"\n");' -- "$LOG"

 # Reads the log's ok lines, newest first. `previous` prints rollback's target: the first `to`
 # that is not the pointer's copy (release.sh's rule). `backup` prints the backup field of the
-# line that made the pointer's copy live, the backup a rollback would restore.
+# line that made the pointer's copy live, the backup a rollback would restore. `arrival` prints the
+# activation and `from` of the line that moved the stack onto the pointer's copy from another one,
+# past any same-copy re-pin after it (row 200, sage-1389).
 from_log() {
    [ -f "$LOG" ] || return 1
    node -e '
@@ -168,6 +175,7 @@ for(const l of lines.reverse()){
  if(o.result!=="ok"||!["adopt","activate","rollback"].includes(o.op)||!o.to)continue;
  if(mode==="previous"&&o.to!==current){process.stdout.write(o.to+"\n");process.exit(0)}
  if(mode==="backup"&&o.to===current){if(o.backup)process.stdout.write(o.backup+"\n");process.exit(o.backup?0:1)}
+  if(mode==="arrival"&&o.to===current&&o.from!==current){process.stdout.write(`${o.activation??""} ${o.from??""}\n`);process.exit(0)}
 }
 process.exit(1);' -- "$LOG" "$1" "$P_COPY"
 }
@@ -195,15 +203,23 @@ read_units() {
    U_CLAUDE=""
    read -r -a argv <<< "$env"
    for tok in "${argv[@]}"; do case "$tok" in MOSAIC_CLAUDE_BIN=*) U_CLAUDE="${tok#MOSAIC_CLAUDE_BIN=}" ;; esac; done
-    read -r -a argv <<< "$console_argv"
-    U_CONSOLE=()
+    serve_flags "$console_argv" || return 1
+    U_CONSOLE=("${SERVE_FLAGS[@]}")
+}
+
+# Sets SERVE_FLAGS (array) to the Console argv $1 after `serve`, without --checkout and its value;
+# returns 1 with no `serve`.
+serve_flags() {
+    local -a argv
+    read -r -a argv <<< "$1"
+    SERVE_FLAGS=()
    local i serve=0
    for ((i = 0; i < ${#argv[@]}; i++)); do
        if [ "$serve" = 0 ]; then [ "${argv[i]}" != serve ] || serve=1; continue; fi
        if [ "${argv[i]}" = --checkout ]; then i=$((i + 1)); continue; fi
-        U_CONSOLE+=("${argv[i]}")
+        SERVE_FLAGS+=("${argv[i]}")
    done
-    [ "$serve" = 1 ] || return 1
+    [ "$serve" = 1 ]
 }

 console_port() {
@@ -244,14 +260,17 @@ target_schema() {
 in_chain() { local v; for v in "${T_CHAIN[@]}"; do [ "$v" != "$1" ] || return 0; done; return 1; }

 # The item 3 checks on the target copy, in order: copy, schema, already-active. An activate that
-# sets a proof pair, or drops the pointer's pair with --no-proof, may name the pointer's copy: it
-# re-pins the live copy with new Console flags (row 187, Part B's B3 and B-R1).
+# sets a proof pair, drops the pointer's pair with --no-proof, drops the pointer's --send with
+# --no-send, or turns on --sso, may name the pointer's copy: it re-pins the live copy with new
+# Console flags (row 187, Part B's B3 and B-R1; row 189, mos-0972; row 200, the phase 2 window).
 check_target() {
    copy_exists "$TO" 2>/dev/null || refuse copy-missing "no copy $TO in $COPIES"
    copy_ok "$TO" 2>/dev/null || refuse copy-unreachable "$TO is not reachable from refactor and origin/refactor"
    target_schema "$TO" || refuse copy-schema-unknown "cannot read SCHEMA_VERSION and its chain from $COPIES/$TO/packages/bus/src/store.mjs"
    [ "$TO" != "$P_COPY" ] || [ -n "$PROOF_HEADER" ] ||
        { [ "$NO_PROOF" = 1 ] && [[ " ${P_CONSOLE[*]} " == *" --proof-header "* ]]; } ||
+        { [ "$NO_SEND" = 1 ] && [[ " ${P_CONSOLE[*]} " == *" --send "* ]]; } ||
+        { [ "$SSO" = 1 ] && [[ " ${P_CONSOLE[*]} " != *" --sso "* ]]; } ||
        refuse already-active "$TO is the pointer's copy"
 }

@@ -664,16 +683,17 @@ flags_drift() {
 console_for_target() {
    local supported=0 main=7332 inherited="" i
    local -a without_tester=()
+    sso_base
    grep -q -- '--tester-port' "$COPIES/$TO/packages/webui/src/cli.mjs" && supported=1
-    for ((i = 0; i < ${#P_CONSOLE[@]}; i++)); do
-        if [ "${P_CONSOLE[i]}" = --tester-port ]; then
-            i=$((i + 1)); inherited="${P_CONSOLE[i]:-}"
+    for ((i = 0; i < ${#BASE_CONSOLE[@]}; i++)); do
+        if [ "${BASE_CONSOLE[i]}" = --tester-port ]; then
+            i=$((i + 1)); inherited="${BASE_CONSOLE[i]:-}"
        else
-            without_tester+=("${P_CONSOLE[i]}")
-            if [ "${P_CONSOLE[i]}" = --port ]; then main="${P_CONSOLE[i+1]:-7332}"; fi
+            without_tester+=("${BASE_CONSOLE[i]}")
+            if [ "${BASE_CONSOLE[i]}" = --port ]; then main="${BASE_CONSOLE[i+1]:-7332}"; fi
        fi
    done
-    RUN_CONSOLE=("${P_CONSOLE[@]}")
+    RUN_CONSOLE=("${BASE_CONSOLE[@]}")
    DROP_TESTER=""
    if [ -n "$TESTER_PORT" ]; then
        # --plan lists both with its other refusals (row 180); outside it they end the run.
@@ -689,7 +709,205 @@ console_for_target() {
        RUN_CONSOLE=("${without_tester[@]}")
        DROP_TESTER="--tester-port $inherited"
    fi
-    proof_for_target
+    if [ "$SSO" = 1 ]; then sso_for_target; else proof_for_target; fi
+    send_for_target
+    sso_checks
+}
+
+sso_supported() { grep -q -- '--sso' "$COPIES/$TO/packages/webui/src/cli.mjs"; }
+has_flag() { local f="$1"; shift; [[ " $* " == *" $f "* ]]; }
+
+# Row 200 (#1698, R1): a rollback from an --sso pointer to a copy whose Console has no --sso. The
+# pointer no longer holds the preview set that Console ran with, so the flags come from the rollback
+# set of the activation that moved the stack onto the pointer's copy from the rollback target. A
+# same-copy re-pin after it has a set of its own, holding the same copy's earlier flags, so the
+# pointer's own activation is the wrong set (sage-1389). The set's show-mosaic-webui.service.txt is
+# the Console unit as it was before that run, checked against the set's SHA256SUMS. Sets
+# BASE_CONSOLE (the flags console_for_target starts from), SSO_PLAN and SSO_STEP. SSO_NO_TARGET
+# skips sso_checks after a refusal here, so --plan lists that refusal alone.
+sso_base() {
+    BASE_CONSOLE=("${P_CONSOLE[@]}") SSO_PLAN="" SSO_STEP="" SSO_NO_TARGET=""
+    has_flag --sso "${P_CONSOLE[@]}" || return 0
+    [ "$SSO" = 1 ] || SSO_PLAN="sso: carried"
+    [ "$OP" = rollback ] && ! sso_supported || return 0
+    local f="show-$CONSOLE_UNIT.txt" argv="" why="" act="" from="" set
+    read -r act from <<< "$(from_log arrival || true)"
+    set="$STATE/stack-rollback/$act"
+    if [ "$from" != "$TO" ]; then why="the log names no activation that moved the stack from $TO onto $P_COPY"
+    elif ! [[ "$act" =~ ^[0-9]{8}T[0-9]{6}Z-[0-9a-f]{12}(-[1-9])?$ ]]; then why="the activation $act that moved the stack onto $P_COPY names no rollback set"
+    elif [ ! -f "$set/$f" ] || [ ! -f "$set/SHA256SUMS" ]; then why="$set has no $f and SHA256SUMS"
+    elif [ "$(sum_of "$set" "$f")" != "$(sha256sum < "$set/$f" | cut -d' ' -f1)" ]; then why="$set/$f does not match the set's SHA256SUMS"
+    else
+        argv="$(argv_of "$(cat "$set/$f")")"
+        if ! unquoted "$argv" || ! serve_flags "$argv"; then why="$set/$f holds no Console argv this script can read"
+        elif has_flag --sso "${SERVE_FLAGS[@]}"; then why="the Console in $set/$f already ran with --sso"
+        fi
+    fi
+    if [ -n "$why" ]; then
+        SSO_NO_TARGET=1
+        check_refuse sso-rollback-flags "$TO's Console does not support --sso, and the Console flags it ran with cannot be read: $why"
+        return 0
+    fi
+    # --send and --tester-port follow the pointer, so a --no-send or a tester port set after that
+    # activation stays (row 189's rule that rollback carries --send off).
+    local i
+    BASE_CONSOLE=()
+    for ((i = 0; i < ${#SERVE_FLAGS[@]}; i++)); do
+        case "${SERVE_FLAGS[i]}" in
+            --send) ;;
+            --tester-port) i=$((i + 1)) ;;
+            *) BASE_CONSOLE+=("${SERVE_FLAGS[i]}") ;;
+        esac
+    done
+    for ((i = 0; i < ${#P_CONSOLE[@]}; i++)); do
+        case "${P_CONSOLE[i]}" in
+            --send) BASE_CONSOLE+=(--send) ;;
+            --tester-port) i=$((i + 1)); BASE_CONSOLE+=(--tester-port "${P_CONSOLE[i]:-}") ;;
+        esac
+    done
+    SSO_PLAN="sso: dropped; $TO's Console does not support --sso, so the rollback takes the Console flags from $set/$f, with --send and --tester-port as the pointer has them"
+    SSO_STEP="drop --sso; $TO's Console does not support it, so the Console flags come from $set/$f"
+}
+
+# Row 200 (#1698): activate --sso drops the preview set and the proof pair, which serve refuses beside
+# it, and puts --sso where webui-service.sh renders it: after the other flags, before --send and
+# --tester-port. Sets SSO_DROP (the plan's dropped preview flags), PROOF_PLAN and PROOF_STEP.
+sso_for_target() {
+    local header="" file="" i
+    local -a kept=()
+    SSO_DROP=""
+    for ((i = 0; i < ${#RUN_CONSOLE[@]}; i++)); do
+        case "${RUN_CONSOLE[i]}" in
+            --public-host | --auth-header | --allow-user) SSO_DROP+=" ${RUN_CONSOLE[i]} ${RUN_CONSOLE[i + 1]:-}"; i=$((i + 1)) ;;
+            --proof-header) i=$((i + 1)); header="${RUN_CONSOLE[i]:-}" ;;
+            --proof-file) i=$((i + 1)); file="${RUN_CONSOLE[i]:-}" ;;
+            --sso) ;;
+            *) kept+=("${RUN_CONSOLE[i]}") ;;
+        esac
+    done
+    RUN_CONSOLE=()
+    for ((i = 0; i < ${#kept[@]}; i++)); do
+        case "${kept[i]}" in --send | --tester-port) break ;; esac
+        RUN_CONSOLE+=("${kept[i]}")
+    done
+    RUN_CONSOLE+=(--sso "${kept[@]:i}")
+    PROOF_PLAN="proof: off" PROOF_STEP=""
+    if [ -n "$header" ]; then
+        PROOF_PLAN="proof: dropped; --sso drops header $header"
+        PROOF_STEP="drop --proof-header $header --proof-file $file; --sso was given"
+    fi
+}
+
+# Row 200 item 2: whenever the run's Console flags hold --sso, the checks row 192's --sso start runs,
+# before anything stops: a target Console with --sso, console.sso in config.json as the target's own
+# checkConsole reads it, and each provider's slot file. The slot gets lstat, stat and realpath
+# only; this script never opens it. Also sets the plan's sso: line for activate --sso.
+SSO_JS='
+const {readFileSync}=require("node:fs");const {pathToFileURL}=require("node:url");
+const [copy,file]=process.argv.slice(1);
+(async()=>{
+  const {checkConsole}=await import(pathToFileURL(`${copy}/packages/webui/src/sso-config.mjs`).href);
+  let doc;
+  // A JSON.parse message can quote the text, so it is not passed on.
+  try{doc=JSON.parse(readFileSync(file,"utf8"))}catch{throw new Error(`cannot read ${file} as JSON`)}
+  if(!doc?.console?.sso)throw new Error("there is no console.sso in the system config");
+  checkConsole(doc.console);
+  for(const p of doc.console.sso.providers)process.stdout.write(`${p.id} ${p.clientSecret.slot}\n`);
+})().catch((e)=>{process.stdout.write(String(e?.message??e).split("\n")[0]);process.exit(1)});'
+sso_checks() {
+    has_flag --sso "${RUN_CONSOLE[@]}" || return 0
+    if [ "$SSO" = 1 ]; then
+        local t carried="" dropped="${SSO_DROP# }"
+        for t in "${RUN_CONSOLE[@]}"; do [ "$t" = --sso ] || carried+="${carried:+ }$t"; done
+        SSO_PLAN="sso: on; drops ${dropped:-nothing}; carries ${carried:-nothing}"
+        SSO_STEP="turn on --sso${SSO_DROP:+; drop$SSO_DROP}"
+    fi
+    [ -z "$SSO_NO_TARGET" ] || return 0
+    sso_supported || { check_refuse sso-target "$TO's Console does not support --sso"; return 0; }
+    local cfg="${MOSAIC_CONFIG:-$HOME/.config/mosaic-dev/config.json}" out id slot path why
+    # N4 (webby-0019, sage-1403): a pre-phase-1 loader refuses a console key, so with the key not yet
+    # written and the stack on another copy, the first step is the re-pin without --sso.
+    local first=""
+    if ! out="$(node -e "$SSO_JS" -- "$COPIES/$TO" "$cfg" 2>&1)"; then
+        out="${out%%$'\n'*}"
+        [ "$out" != "there is no console.sso in the system config" ] || [ "$P_COPY" = "$TO" ] ||
+            first="; activate $TO without --sso first, then write console.sso, then run activate $TO --sso"
+        check_refuse sso-config "$TO's Console would refuse its --sso start: $out$first"
+        return 0
+    fi
+    while read -r id slot; do
+        path="$(dirname "$cfg")/secrets/mosaic-stack/$slot"
+        why="$(slot_problem "$path")"
+        [ -z "$why" ] || check_refuse sso-slot "console.sso provider $id client secret slot $path $why"
+    done <<< "$out"
+}
+
+# Why a slot file can't serve, or nothing: readSlot's checks in packages/webui/src/sso.mjs, in its
+# order, from lstat, stat and realpath only, then a size of 0 for its one-non-empty-line rule.
+slot_problem() {
+    local st uid mode size type real copies repo
+    [ -e "$1" ] || [ -L "$1" ] || { echo "is missing"; return; }
+    [ ! -L "$1" ] || { echo "is a symbolic link"; return; }
+    st="$(stat -c '%u:%a:%s:%F' -- "$1" 2>/dev/null)" || { echo "cannot be read with stat"; return; }
+    uid="${st%%:*}" st="${st#*:}"
+    mode="${st%%:*}" st="${st#*:}"
+    size="${st%%:*}" type="${st#*:}"
+    case "$type" in "regular file" | "regular empty file") ;; *) echo "is not a regular file"; return ;; esac
+    [ "$uid" = "$(id -u)" ] || { echo "is owned by uid $uid, not $(id -u), the uid this script runs as"; return; }
+    (( (8#$mode & 8#077) == 0 )) || { echo "has mode $mode, which gives group or other permission bits"; return; }
+    # REPO is $(pwd), which keeps a symlink in the path the script ran by (webby-0028 N1).
+    real="$(realpath -e -- "$1")" && copies="$(realpath -m -- "$COPIES")" && repo="$(realpath -m -- "$REPO")" || { echo "cannot be resolved"; return; }
+    case "$real" in "$repo" | "$repo"/* | "$copies" | "$copies"/*) echo "is inside the repository or the copies"; return ;; esac
+    [ "$size" != 0 ] || echo "is empty"
+}
+
+# Row 200 item 3 and the design's phase 2 rollback order: a config.json with a `console` key must be
+# one the target's loader reads, or its bus, Console and seats fail on their next read. Runs the
+# target's own scripts/mosaic-config.mjs validate; its output, the resolved config, is not kept.
+config_checks() {
+    local cfg="${MOSAIC_CONFIG:-$HOME/.config/mosaic-dev/config.json}" out loader="$COPIES/$TO/scripts/mosaic-config.mjs" first
+    # 0: a console key; 1: no key, or no file; 2: the file doesn't parse, so whether it holds the key
+    # is unknown, and the run refuses rather than pass it (webby-0028 N2). load_config already exits on
+    # such a file before anything is read or stopped, so this is reached only if the file changes after it.
+    local key=0
+    node -e 'const fs=require("fs"),f=process.argv[1];if(!fs.existsSync(f))process.exit(1);let d;try{d=JSON.parse(fs.readFileSync(f,"utf8"))}catch{process.exit(2)}
+process.exit(d!==null&&typeof d==="object"&&Object.hasOwn(d,"console")?0:1)' -- "$cfg" 2>/dev/null || key=$?
+    [ "$key" != 1 ] || return 0
+    if [ "$key" != 0 ]; then
+        check_refuse config-console-key "$cfg cannot be read as JSON, so whether $TO's loader reads it is unknown; fix the config first, then run the $OP again"
+        return 0
+    fi
+    if [ ! -f "$loader" ]; then out="it has no scripts/mosaic-config.mjs"
+    elif out="$(MOSAIC_CONFIG="$cfg" node "$loader" validate 2>&1 >/dev/null)"; then return 0
+    fi
+    first="${out%%$'\n'*}"
+    check_refuse config-console-key "$cfg holds a console key, and $TO's loader refuses it ($first); remove the key first (restore the config.json backup from the window's step 1), then run the $OP again"
+}
+
+# Row 189 (mos-0972): --no-send drops --send from RUN_CONSOLE, so the unit and the pointer both lose
+# it; without the flag the pointer's --send goes on unchanged. Rollback and pm-on never take it, so
+# they carry the pointer as it is. Sets SEND_PLAN (the plan's send: line) and SEND_STEP.
+send_for_target() {
+    local had=0 i
+    local -a without_send=()
+    for ((i = 0; i < ${#RUN_CONSOLE[@]}; i++)); do
+        if [ "${RUN_CONSOLE[i]}" = --send ]; then had=1; else without_send+=("${RUN_CONSOLE[i]}"); fi
+    done
+    SEND_STEP=""
+    if [ "$NO_SEND" = 1 ]; then
+        RUN_CONSOLE=("${without_send[@]}")
+        if [ "$had" = 1 ]; then
+            SEND_PLAN="send: dropped; --no-send was given"
+            SEND_STEP="drop --send; --no-send was given"
+        else
+            SEND_PLAN="send: off; --no-send was given and the pointer holds no --send"
+            SEND_STEP="--no-send was given and the pointer holds no --send, so there is nothing to drop"
+        fi
+    elif [ "$had" = 1 ]; then
+        SEND_PLAN="send: carried"
+    else
+        SEND_PLAN="send: off"
+    fi
 }

 # Row 187: the row 178 proof pair in RUN_CONSOLE. A new pair replaces the pointer's and goes last;
@@ -769,7 +987,7 @@ proof_checks() {
 # Why the proof file can't serve, or nothing. lstat, stat and realpath only; the order follows
 # webui-service.sh render, which refuses the same files.
 proof_file_problem() {
-    local st uid mode type real copies
+    local st uid mode type real copies repo
    case "$1" in /*) ;; *) echo "is not an absolute path"; return ;; esac
    case "$1" in *[!A-Za-z0-9/._+-]*) echo "holds a character outside [A-Za-z0-9/._+-]"; return ;; esac
    [ ! -L "$1" ] || { echo "is a symlink"; return; }
@@ -777,8 +995,8 @@ proof_file_problem() {
    uid="${st%%:*}" st="${st#*:}"
    mode="${st%%:*}" type="${st#*:}"
    case "$type" in "regular file" | "regular empty file") ;; *) echo "is not a regular file"; return ;; esac
-    real="$(realpath -e -- "$1")" && copies="$(realpath -m -- "$COPIES")" || { echo "cannot be resolved"; return; }
-    case "$real" in "$REPO" | "$REPO"/* | "$copies" | "$copies"/*) echo "is inside the repository or the copies"; return ;; esac
+    real="$(realpath -e -- "$1")" && copies="$(realpath -m -- "$COPIES")" && repo="$(realpath -m -- "$REPO")" || { echo "cannot be resolved"; return; }
+    case "$real" in "$repo" | "$repo"/* | "$copies" | "$copies"/*) echo "is inside the repository or the copies"; return ;; esac
    [ "$mode" = 600 ] || [ "$mode" = 400 ] || { echo "has mode $mode, not 600 or 400"; return; }
    [ "$uid" = "$(id -u)" ] || echo "is owned by uid $uid, not $(id -u), the uid this script runs as"
 }
@@ -943,6 +1161,8 @@ plan() {
    echo "bus: scripts/bus-service.sh install --copy $TO --copies $COPIES$([ "$RUN_PM" = 0 ] || echo ' --pm') --claude $P_CLAUDE"
    [ -z "$DROP_TESTER" ] || echo "drop $DROP_TESTER; the target Console does not support it"
    echo "$PROOF_PLAN"
+    echo "$SEND_PLAN"
+    [ -z "$SSO_PLAN" ] || echo "$SSO_PLAN"
    echo "Console: scripts/webui-service.sh install --copy $TO --copies $COPIES${RUN_CONSOLE[*]:+ ${RUN_CONSOLE[*]}}"
    echo "CLI: scripts/stack-copy.sh wrapper $TO --copies $COPIES --bin $BIN"
    local r
@@ -956,6 +1176,8 @@ run_steps() {
    capture || refuse capture-failed "could not write the rollback set $RS; nothing was stopped"
    [ -z "$DROP_TESTER" ] || say "drop $DROP_TESTER; the target Console does not support it"
    [ -z "$PROOF_STEP" ] || say "$PROOF_STEP"
+    [ -z "$SEND_STEP" ] || say "$SEND_STEP"
+    [ -z "$SSO_STEP" ] || say "$SSO_STEP"
    trap 'after_fail signal' INT TERM HUP
    stop_both || rollback_in_run stop-timeout
    if [ -e "$STORE" ]; then
@@ -1015,9 +1237,10 @@ do_activate() {
    pointer_for_business
    run_pm
    [ "$P_PENDING" = 0 ] || check_refuse pm-pending "the pointer is pending (activate --pm-after-harness); run pm-on or rollback first"
-    if [ "$PLAN" = 1 ]; then check_target; console_for_target; plugin_checks; plan; exit 0; fi
+    if [ "$PLAN" = 1 ]; then check_target; console_for_target; plugin_checks; config_checks; plan; exit 0; fi
    precheck
    plugin_checks
+    config_checks
    new_activation
    run_steps migrate
 }
@@ -1027,9 +1250,10 @@ do_rollback() {
    pointer_for_business
    TO="$(from_log previous)" || refuse no-previous "the log names no earlier copy than $P_COPY"
    run_pm
-    if [ "$PLAN" = 1 ]; then check_target; console_for_target; plugin_checks; plan; exit 0; fi
+    if [ "$PLAN" = 1 ]; then check_target; console_for_target; plugin_checks; config_checks; plan; exit 0; fi
    precheck
    plugin_checks
+    config_checks
    [ "$P_SCHEMA" = "$T_SCHEMA" ] || [ -n "$RESTORE" ] || refuse schema-differs "the store is at $P_SCHEMA and $TO expects $T_SCHEMA; pass --restore ACTIVATION"
    new_activation
    if [ -n "$RESTORE" ]; then
@@ -1478,7 +1702,8 @@ STORE="$DATA/bus/bus.sqlite"
 BUS_UNIT="mosaic-bus@$BUSINESS.service"
 FROM="" TO="" ACT="" RS="" POST="" BACKUP="" TAKEN="" RESTORED="" STEPS="" COUNT="" UNCLEAN="" FAIL=""
 STORE_SCHEMA="" START_EPOCH="" START_MS=0 GATE="" GATE_WHY="" S_CHANGED=""
-P_COPY="" P_PM=0 P_PENDING=0 P_SCHEMA="" P_CLAUDE="" P_CONSOLE=() RUN_PM=0 RUN_PENDING=0 RUN_CONSOLE=() DROP_TESTER="" PROOF_PLAN="" PROOF_STEP="" PLAN_REFUSE=()
+P_COPY="" P_PM=0 P_PENDING=0 P_SCHEMA="" P_CLAUDE="" P_CONSOLE=() RUN_PM=0 RUN_PENDING=0 RUN_CONSOLE=() DROP_TESTER="" PROOF_PLAN="" PROOF_STEP="" SEND_PLAN="" SEND_STEP="" PLAN_REFUSE=()
+BASE_CONSOLE=() SERVE_FLAGS=() SSO_PLAN="" SSO_STEP="" SSO_DROP="" SSO_NO_TARGET=""
 R="" R_RC=0 R_EARLY=() R_BK="" R_HOST_PID="" R_CONSOLE_PID="" R_STARTED="" LIVE_CFG="" LIVE_BIZ=""
 case "$OP" in
    adopt) do_adopt ;;
@@ -151,6 +151,52 @@ else
    FAIL=$((FAIL+1)); echo "${C_FAIL}FAIL${C_RESET} env exports resolve correctly"
 fi

+# --- Q175 phase 1 (#1690), design test 25: the optional console key ---
+# Shape only. The slot path is a FIFO, so a loader that opened the slot would block and the
+# timeout would fail the case; no case reads a slot file.
+mkdir -p "$SANDBOX/secrets/mosaic-stack"
+mkfifo "$SANDBOX/secrets/mosaic-stack/console-sso-test"
+sso_body() {
+    printf '{"configVersion":1,"environment":"development","dataRoot":"%s","execution":{"backend":"docker","provider":"zai","model":"m"},"console":%s}' "$DATA_ROOT" "$1"
+}
+# provider [ALGS] [CLIENT_SECRET]: one provider entry; an empty argument takes the valid value.
+provider() {
+    local algs='["RS256"]' secret='{"slot":"console-sso-test"}'
+    [ -n "${1:-}" ] && algs="$1"
+    [ -n "${2:-}" ] && secret="$2"
+    printf '{"id":"fake","issuer":"https://op.test/app/","clientId":"client-1","clientSecret":%s,"algs":%s,"subjects":[{"sub":"user-1","name":"jason.woltje"}]}' "$secret" "$algs"
+}
+cfg sso-valid.json "$(sso_body '{"sso":{"publicOrigin":"https://console.test","providers":['"$(provider)"']}}')"
+OUT="$(MOSAIC_CONFIG="$SANDBOX/sso-valid.json" timeout 20 $CONFIG_OP validate 2>&1)"
+[ $? -eq 0 ] && printf '%s' "$OUT" | grep -q '"publicOrigin": "https://console.test"'
+check "valid console.sso loads and is in the output" $?
+
+# expect_refusal NAME PATH-IN-MESSAGE BODY: exit 2, and the message names the bad key path.
+expect_refusal() {
+    cfg sso-bad.json "$2"
+    local err rc
+    err="$(MOSAIC_CONFIG="$SANDBOX/sso-bad.json" timeout 20 $CONFIG_OP validate 2>&1 >/dev/null)"
+    rc=$?
+    [ "$rc" -eq 2 ] && printf '%s' "$err" | grep -qF -- "$3"
+    check "$1 (exit $rc)" $?
+}
+expect_refusal "console.sso HS256 alg exits 2 naming the path" \
+    "$(sso_body '{"sso":{"publicOrigin":"https://console.test","providers":['"$(provider '["HS256"]')"']}}')" 'console.sso.providers[0].algs[0] must be one of'
+expect_refusal "console.sso alg none exits 2 naming the path" \
+    "$(sso_body '{"sso":{"publicOrigin":"https://console.test","providers":['"$(provider '["RS256","none"]')"']}}')" 'console.sso.providers[0].algs[1] must be one of'
+expect_refusal "console.sso missing slot field exits 2 naming the path" \
+    "$(sso_body '{"sso":{"publicOrigin":"https://console.test","providers":['"$(provider '' '{}')"']}}')" 'console.sso.providers[0].clientSecret.slot is required'
+expect_refusal "console.sso slot name outside the pattern exits 2 naming the path" \
+    "$(sso_body '{"sso":{"publicOrigin":"https://console.test","providers":['"$(provider '' '{"slot":"../x"}')"']}}')" 'console.sso.providers[0].clientSecret.slot must match'
+expect_refusal "unknown key under console exits 2 naming the path" \
+    "$(sso_body '{"sso":{"publicOrigin":"https://console.test","providers":['"$(provider)"']},"extra":1}')" 'console.extra is not a supported key'
+
+# Without the key: the output is exactly what the loader printed before phase 1 (sage-1340, F2).
+cfg no-console.json '{"configVersion":1,"environment":"development","dataRoot":"'$DATA_ROOT'","execution":{"backend":"docker","provider":"zai","model":"m"}}'
+EXPECTED="$(printf '{\n  "configVersion": 1,\n  "environment": "development",\n  "dataRoot": "%s",\n  "execution": {\n    "backend": "docker",\n    "provider": "zai",\n    "model": "m",\n    "adapter": "pi"\n  }\n}' "$DATA_ROOT")"
+[ "$(MOSAIC_CONFIG="$SANDBOX/no-console.json" timeout 20 $CONFIG_OP validate)" = "$EXPECTED" ]
+check "config without console loads with unchanged output" $?
+
 # --- validation must not modify the file ---
 SUM_INVALID_BEFORE=$(sha256sum "$SANDBOX/invalid.json" | cut -d' ' -f1)
 MOSAIC_CONFIG="$SANDBOX/invalid.json" $CONFIG_OP validate >/dev/null 2>&1
@@ -49,6 +49,9 @@
 # character set and refused otherwise. --proof-header NAME --proof-file PATH
 # go together under preview; only the path is carried here, never the secret.
 # render checks ownership, mode and location without opening the proof file.
+# --sso (Q175 phase 1, #1690): the Console signs people in itself from
+# console.sso in config.json. It refuses the preview set and the proof pair,
+# and --send takes it in place of the preview set. Nothing secret is carried.
 #
 # There is no start, stop, enable or restart verb. The Console reads the
 # main listener's bus through the human transport; the optional loopback
@@ -68,7 +71,7 @@ REPO="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
 TEMPLATE="$REPO/packages/webui/systemd/mosaic-webui.service.in"
 UNIT_NAME="mosaic-webui.service"
 USAGE="usage: scripts/webui-service.sh copy COMMIT [--copies DIR] [--allow-worktree] | render [--copy ID [--copies DIR]] [FLAGS] | install --copy ID [--copies DIR] [--dir DIR] [--no-reload] [--allow-worktree] [FLAGS] | uninstall [--dir DIR] [--no-reload] | status [--dir DIR]
-  FLAGS: [--port N] [--business ID] [--board URL] [--public-host NAME --auth-header HEADER --allow-user ID [--send]] [--tester-port N] [--proof-header NAME --proof-file PATH]
+  FLAGS: [--port N] [--business ID] [--board URL] [--sso [--send] | --public-host NAME --auth-header HEADER --allow-user ID [--send]] [--tester-port N] [--proof-header NAME --proof-file PATH]
  --tester-port: 1024..65535, different from --port and never 7332; loopback tester listener.
  --allow-worktree is for the tests only: copy and install otherwise refuse outside the canonical checkout."

@@ -91,6 +94,7 @@ PUBLIC_HOST=""
 AUTH_HEADER=""
 ALLOW_USER=""
 SEND=0
+SSO=0
 PROOF_HEADER=""
 PROOF_FILE=""
 PROOF_SET=0
@@ -114,6 +118,7 @@ parse_flags() {
            --proof-header) [ $# -ge 2 ] || usage; PROOF_HEADER="$2"; PROOF_SET=1; SERVE_SET=1; shift 2 ;;
            --proof-file) [ $# -ge 2 ] || usage; PROOF_FILE="$2"; PROOF_SET=1; SERVE_SET=1; shift 2 ;;
            --send) SEND=1; SERVE_SET=1; shift ;;
+            --sso) SSO=1; SERVE_SET=1; shift ;;
            *) usage ;;
        esac
    done
@@ -166,9 +171,13 @@ serve_flags() {
    [ -z "$PUBLIC_HOST" ] || preview=$((preview + 1))
    [ -z "$AUTH_HEADER" ] || preview=$((preview + 1))
    [ -z "$ALLOW_USER" ] || preview=$((preview + 1))
-    # serve refuses --send without the preview set; refuse it here first,
-    # so no unit is written that would only exit 2 at start.
-    [ "$SEND" = 0 ] || [ "$preview" -eq 3 ] || die "--send needs the preview mode (--public-host, --auth-header and --allow-user)"
+    # serve refuses --sso with the preview set or the proof pair, and --send
+    # without --sso or the preview set; refuse them here first, so no unit is
+    # written that would only exit 2 at start.
+    if [ "$SSO" = 1 ] && { [ "$preview" -ne 0 ] || [ "$PROOF_SET" = 1 ]; }; then
+        die "--sso cannot be combined with --public-host, --auth-header, --allow-user or --proof-*"
+    fi
+    [ "$SEND" = 0 ] || [ "$preview" -eq 3 ] || [ "$SSO" = 1 ] || die "--send needs the preview mode (--public-host, --auth-header and --allow-user) or --sso"
    if [ "$preview" -ne 0 ]; then
        [ "$preview" -eq 3 ] || die "--public-host, --auth-header and --allow-user go together: all three or none"
        case "$PUBLIC_HOST" in [A-Za-z0-9]*) ;; *) die "public host must be a hostname, no port or scheme: $PUBLIC_HOST" ;; esac
@@ -201,6 +210,7 @@ serve_flags() {
        { [ "$proof_mode" = 600 ] || [ "$proof_mode" = 400 ]; } && [ "$proof_uid" = "$(id -u)" ] || die "invalid proxy proof file metadata"
        flags="$flags --proof-header $PROOF_HEADER --proof-file $PROOF_FILE"
    fi
+    [ "$SSO" = 0 ] || flags="$flags --sso"
    [ "$SEND" = 0 ] || flags="$flags --send"
    [ "$TESTER_SET" = 0 ] || flags="$flags --tester-port $TESTER_PORT"
    echo "$flags"
@@ -385,14 +395,17 @@ status_unit() {
    else
        echo "copy: none; the unit runs from $wd"
    fi
-    # render puts --send after the allowed user and optional proof pair,
-    # before the tester port. The allowed user
+    # render puts --send after the allowed user and optional proof pair, or
+    # after --sso, before the tester port. The allowed user
    # starts with a letter or digit (N5), so it is never the value --send.
-    if grep -Eq '^ExecStart=.* --allow-user [^ ][^ ]*( --proof-header [^ ]+ --proof-file /[^ ]+)? --send( --tester-port [0-9]+)?$' "$target"; then
+    if grep -Eq '^ExecStart=.*( --allow-user [^ ][^ ]*( --proof-header [^ ]+ --proof-file /[^ ]+)?| --sso) --send( --tester-port [0-9]+)?$' "$target"; then
        echo "send: on (--send; human messages to roles)"
    else
        echo "send: off (read-only)"
    fi
+    if grep -Eq '^ExecStart=.* --sso( --send)?( --tester-port [0-9]+)?$' "$target"; then
+        echo "sign-in: the Console's own (--sso)"
+    fi
    local tester_port
    tester_port="$(sed -n 's/^ExecStart=.* --tester-port \([0-9][0-9]*\)$/\1/p' "$target")"
    if [ -n "$tester_port" ]; then
Author	SHA1	Message	Date
jason.woltje	d4ec998cce	launchpad: row 200 packet, N2 guard kept and mutant 12 ruling (sage-1446)	2026-10-20 15:29:41 -05:00
jason.woltje	e3fd9f3a08	stack-release: round 2, slot and proof checks resolve REPO, config_checks refuses a config that doesn't parse (row 200, #1698 , sage-1432)	2026-10-20 15:25:04 -05:00
jason.woltje	d163cfccb5	launchpad: row 200 packet, webby-0028 notes N1-N4 (#1698 )	2026-10-20 15:16:08 -05:00
jason.woltje	39b52b71f5	launchpad: row 200 packet, BUILD.md, mutants, base and manifest (#1698 )	2026-10-20 15:09:17 -05:00
jason.woltje	5dc0b5534b	stack-release: activate --sso, its refusals before any stop, and the rollback to a Console without it (row 200, #1698 ) activate --sso drops --public-host, --auth-header, --allow-user and any proof pair and puts --sso before --send and --tester-port; --plan prints an sso: line. Before any stop: sso-target, sso-config (the target's own checkConsole; from another copy with no key it names the re-pin without --sso as the first step) and sso-slot (lstat/stat/realpath only). A rollback from --sso to a Console without it takes the flags from the arrival activation's rollback set (sage-1389) or refuses sso-rollback-flags. Activate and rollback refuse config-console-key when the target's loader refuses the config's console key. T56, TOOLS.md.	2026-10-20 15:08:19 -05:00
jason.woltje	4d487dfdc4	webui: Q175 phase 1 round 2, absolute post-sign-in Location checked on publicOrigin (row 192, #1690 ) webby-0019 B1, sage-1403: returnURL builds the Location from publicOrigin plus the parsed pathname and search, checks the origin again and returns the href, so a dot-segment `//host` path stays on the Console. Test 14 covers Webby's three cases and asserts each Location's origin; mutant 22 restores the r1 returnPath (killed). N1 design blob cite, N2 listed under Deviations, N3 SIGN_IN_COOKIE comment.	2026-10-20 14:57:55 -05:00
jason.woltje	48359dbfaf	webui: Q175 phase 1, the Console verifies sign-in itself under --sso (row 192, #1690 ) The Console is an OIDC relying party on oauth4webapi 3.8.8 (pinned, root lock). console.sso in config.json, client secrets from slot files, session cookie, public Host only on the human listener, tester listener refuses every sign-in header. Rulings sage-1340 F1/F2/F4 and sage-1347 F7/F8. Tests use a fake OP on loopback only. Packet: agents/launchpad/work/queue-192/BUILD.md.	2026-10-20 14:35:52 -05:00
jason.woltje	aa1bd209e3	gate-lane: row 189 gate timing table for row 197 (Herb)	2026-10-20 14:25:17 -05:00
jason.woltje	ace27dc5eb	row 189 (#1687 ): stack-release.sh activate --no-send drops the Console's --send (Sage; Dewey approve 29485; Sage gate passed)	2026-10-20 14:21:56 -05:00
jason.woltje	a4a42dbac2	plans: stack-release --sso brief (#1698 , Launchpad, reviewer Webby, row 192 F3; chained on 192)	2026-10-20 14:18:08 -05:00
jason.woltje	a31f1a0f8b	plans: row 198 brief records Mos's call, in-process board reads behind the Console's auth (mos-1019)	2026-10-20 14:17:03 -05:00
jason.woltje	992650232f	plans: agent credentials and git identity brief (MVP T1 item 6, #1697 , Megavolt, reviewer Duckworth); Megavolt seat dir	2026-10-20 14:14:33 -05:00
jason.woltje	a7661ada06	plans: row 195 acceptance script takes Gizmoduck's gate item list; B8 issuer and TLS front end (mos-1011)	2026-10-20 14:12:19 -05:00
jason.woltje	f871cb3096	plans: retire the control board writer on 7331 brief (#1696 , Bushroot, reviewer Webby, mos-1008 item 2); Bushroot seat dir	2026-10-20 14:11:21 -05:00
jason.woltje	0bbd23c619	plans: row 195 brief adds the identity provider check and flags any new model account for Jason (mos-1008)	2026-10-20 14:10:28 -05:00
jason.woltje	0217b71c8f	plans: row 195 brief rewritten as the hub on its own host, host left to Jason (#1693 , mos-0998, mos-1005)	2026-10-20 14:07:57 -05:00
jason.woltje	c6f528a32f	plans: second gate lane brief (#1695 , Herb, reviewer Webby, mos-0977 item 6); Herb seat dir; gate template and busy check copies for the row	2026-10-20 14:03:36 -05:00
jason.woltje	96f243fafc	plans: human boundary row brief (P19 333, #1694 , Gander, reviewer Duckworth, mos-0989); Gander seat dir; seat READMEs name the credentials row, not row 195 (now 190b)	2026-10-20 14:00:58 -05:00
jason.woltje	c862699352	sessions: Filbert row 190 design review r3, approved	2026-10-20 14:00:05 -05:00
jason.woltje	48ebee0ffe	plans: row 190 brief scopes isolation to addressing on one uid, points to row 190b (Filbert N7, mos-0986)	2026-10-20 13:58:07 -05:00
jason.woltje	66bdd84b8f	sessions: Filbert row 190 design review r2, changes requested	2026-10-20 13:57:10 -05:00
jason.woltje	6966164f0c	plans: row 190b brief, Melanie's hub under its own Linux user (#1693 , Darkwing, reviewer Duckworth), mos-0986	2026-10-20 13:56:34 -05:00
jason.woltje	53bb594621	sage: common start for MVP T1 builder seats (mos-0974, mos-0977, mos-0981)	2026-10-20 13:55:47 -05:00
jason.woltje	5e01c36833	agents: seat dirs and roster rows for Launchpad, Morgana, Honker (Sage's T1 builders) and Webby, Duckworth (Mos's reviewers); row 193 brief takes Mos's B1 starting rule (mos-0985)	2026-10-20 13:52:28 -05:00
jason.woltje	9f56d2098d	plans: rows 192 and 194 review by Webby, not Filbert or Dewey (mos-0981)	2026-10-20 13:51:25 -05:00
jason.woltje	0599b119f4	plans: MVP T1 briefs, SSO phase 1 (#1690 , Launchpad), human users (#1691 , Morgana), agent lifecycle (#1692 , Honker), mos-0974/0977	2026-10-20 13:49:15 -05:00
jason.woltje	b416d2ede9	sage: Q175 SSO design, Mos C1 condition (mos-0977): straggler check before Jason step 4 in the phase 2 window	2026-10-20 13:49:15 -05:00
jason.woltje	5fc73a729c	revs 2237-2247: row 189 added, briefed, started, in-review round 1 (Dewey, comment 29457); rows 190 (Darkwing) and 191 (Rocko) added and briefed for MVP T1 (mos-0974); darkwing-190-start (rev 2245, Darkwing's) and rocko-191-start (rev 2244, made for Rocko)	2026-10-20 13:47:51 -05:00
jason.woltje	99772421ab	sage: row 189 candidate manifest for Dewey's review (d6116771f)	2026-10-20 13:46:35 -05:00
jason.woltje	da230ca489	plans: MVP T1 briefs, several instances per host (#1688 , Darkwing) and the kill switch (#1689 , Rocko), mos-0974	2026-10-20 13:42:33 -05:00
jason.woltje	4f2d1be68a	sessions: Filbert Q175 SSO design D1/D2 ack	2026-10-20 13:41:20 -05:00
jason.woltje	d55d86bb04	sage: Q175 SSO design r3 fix, Filbert r3 D1 (loader checks slot shape only) and D2 (slot from config dir, scratch Console dataRoot and unreachable issuer)	2026-10-20 13:40:49 -05:00
jason.woltje	c56ccf916e	sessions: Filbert Q175 SSO design review r3, approve with D1	2026-10-20 13:40:20 -05:00
jason.woltje	817e8f51b0	sage: Q175 SSO design r3 for #412 , Filbert r2 C1 (shared loader, config.json inside the phase 2 window, rollback order, test 25) and C2 (401 signed-out page, test 24), notes and Q-E	2026-10-20 13:39:21 -05:00
jason.woltje	5d019d8768	sessions: Filbert Q175 SSO design review r2, changes	2026-10-20 13:34:53 -05:00
jason.woltje	59475fc5a8	sage: row 163 landing record, P19 comments 372/373 on 337/412, and P19 #413 filed for the --no-send row	2026-10-20 13:32:55 -05:00
jason.woltje	1a268249e6	sage: Q175 SSO design r2 for #412 , Filbert r1 B1-B6, rulings Q-B/Q-C/Q-D, config in config.json (mos-0973)	2026-10-20 13:32:26 -05:00
jason.woltje	def2e79327	plans: brief for stack-release activate --no-send (Q175 interim, mos-0972/0973, #1687 , P19 413)	2026-10-20 13:21:30 -05:00
jason.woltje	c30b36fffb	sessions: Filbert Q175 SSO design review r1, changes	2026-10-20 13:19:06 -05:00