diff --git a/agents/darkwing/work/cohort-k1/build-manifest.sha256 b/agents/darkwing/work/cohort-k1/build-manifest.sha256
new file mode 100644
index 00000000..521438e2
--- /dev/null
+++ b/agents/darkwing/work/cohort-k1/build-manifest.sha256
@@ -0,0 +1 @@
+fd10b62c10bff4736b9b4e809b283fe4c5b549fa53fe1121a7bb06258147f0e9  packages/conversation/tests/fake-pi.mjs
diff --git a/agents/darkwing/work/cohort-k1/build.md b/agents/darkwing/work/cohort-k1/build.md
new file mode 100644
index 00000000..230fc291
--- /dev/null
+++ b/agents/darkwing/work/cohort-k1/build.md
@@ -0,0 +1,152 @@
+# Row 46: K1, K3 and K10 on the scope fixtures
+
+Darkwing, 2026-10-09. Issue #1528, reviewer Dewey. Brief:
+`docs/plans/2026-10-09_s4-follow-up-and-cohort.md`, section "Conversation
+cohort: K1, K3 and K10 fail on the scope fixtures". Ruling: lead decision 72.
+The candidate is not committed, staged or pushed.
+
+## Cause
+
+It's a race in the test fixture. Neither the host's systemd setup nor
+`cohort.mjs` is at fault.
+
+`spawnChild` in `packages/conversation/tests/fake-pi.mjs` returns the
+child's pid as soon as `spawn()` returns. The child is `node -e`, and it
+installs its SIGTERM handler only after Node has booted. That takes 16 to
+22 ms on an idle host (`trace-pass.jsonl`) and 43 to 80 ms under 48 CPU burners (`trace-load.jsonl`). A
+TERM that arrives before the handler gets the default action, and the child
+dies of SIGTERM. Each failing assertion is that death seen from a different
+place:
+
+- K1, "the escaped child is a listed member". The child died during the
+  TERM grace, so the freeze-phase enumeration doesn't list it.
+- K3, "the member ignored TERM". `alive(child)` is false at the kill
+  phase.
+- K10, "the member is alive across the crash". Same as K3, before the
+  restart.
+
+The time between spawn and TERM depends on the disk under TMPDIR. The
+fixture puts the claim store there. Before it sends TERM, the controller
+publishes claim revisions, each with an fsync on the file and one on the
+directory (`packages/conversation/src/claim.mjs:159` and `:176`).
+
+| TMPDIR | Disk | write+fsync median (`fsync.txt`) | spawn to TERM | Unfixed K1/K3/K10 |
+|---|---|---|---|---|
+| `/mnt/storage/scratch/tmp` | nvme0, ext4 | 0.65 ms | 12 to 13 ms (`trace-fail.jsonl`) | 0/3 (`runs/canon-scratchtmp.txt`) |
+| `/tmp` | nvme1, ext4 | 4.63 ms | not traced | 3/3 (`runs/canon-tmp.txt`) |
+| `~/darkwing-scratch/tmp` | nvme1, ext4 | 4.69 ms | 53 to 110 ms (`trace-pass.jsonl`) | 3/3 (`runs/canon-hometmp.txt`) |
+
+On the fast disk, TERM lands about 12 ms after spawn, before Node is up.
+In `trace-fail.jsonl` the children never log `ready`.
+
+### Why it started failing
+
+This host's seats now get `TMPDIR=/mnt/storage/scratch/tmp`. My shell had
+it by default, and so did Sage's gate runs. It comes from Vikunja task 59.
+`~/.config/systemd/user/t3code.service.d/tmpdir.conf` was written
+2026-10-04 20:33Z. Its own comment says it takes effect only when
+`t3code.service` restarts, which hasn't happened (active since 2026-09-23),
+and that until then seats get TMPDIR from their harness config. I didn't
+establish what TMPDIR the row 44 gate ran with on 2026-10-05, so the
+"since when" is likely but unproven. The change that exposed the race is a
+seat's TMPDIR. It isn't a systemd or user manager setting, and I changed
+nothing on the host.
+
+### The scope is not a factor
+
+Outside any scope, `race.mjs` gives the same split: a TERM 0, 10 or 20 ms
+after spawn kills 10/10, and at 30 or 60 ms 10/10 survive (`race.txt`).
+Sage's outside-scope probe found the child surviving. I haven't seen that
+probe, but it most likely sent TERM after the handler was in place.
+
+## Receipts in a scope
+
+`scope-receipt.mjs` launches a delegated scope per run, with the same
+`systemd-run` flags `ScopeLauncher` uses. The scope's main process spawns
+the fixture's `ignoreTerm` child and records `systemctl --user show` on the
+scope, then `cgroup.procs` before and after TERM, then the child's exit.
+Output: `receipts.jsonl`.
+
+| Mode | TERM after spawn | In `cgroup.procs` before | After | Child exit |
+|---|---|---|---|---|
+| `race 12` | 20 to 25 ms | 5/5 | 1/5 | 4/5 `signal: "SIGTERM"`, 1 alive |
+| `race 60` | 69 to 71 ms | 5/5 | 5/5 | 5/5 alive 500 ms after TERM |
+| `ready 0` | 28 to 38 ms (ready at 22 to 30) | 5/5 | 5/5 | 5/5 alive 500 ms after TERM |
+
+Each line also carries the scope's `Id`, `LoadState=loaded`,
+`ActiveState=active`, `InvocationID`, `ControlGroup` and `Delegate=yes`.
+The first line, for example:
+`ControlGroup=/user.slice/user-1000.slice/user@1000.service/app.slice/dw-r46-race-12-3662746-0.scope`,
+`before [3662760, 3662788]`, `after [3662760]`, child exit
+`{"code":null,"signal":"SIGTERM","atMs":24}`.
+
+`trace.patch` is the scratch-only instrumentation behind the two traces.
+It logs spawn, ready and the shim's `term` per pid to `$DW_TRACE`. It is
+not part of the candidate.
+
+## The fix
+
+`build.patch` changes one file, `packages/conversation/tests/fake-pi.mjs`:
+
+- The child writes one byte to stdout as its first action after installing
+  its TERM handler. A child without `ignoreTerm` writes it once its code
+  starts.
+- `spawnChild` returns a promise. It resolves with the pid on that byte,
+  then closes its end of the pipe. It rejects if the child exits or errors
+  first, or if 10 s pass.
+- The `child` control op returns that promise. The op dispatcher now
+  answers `ok: false` when an op's promise rejects. Before, a rejected op
+  promise went unhandled, and under Node's default that ends fake-pi. The
+  change covers every op that returns a promise, not only `child`.
+  `childOf` in `cohort.test.mjs` already asserts `r.ok`.
+
+No assertion changed, and `cohort.mjs` is untouched. The three cases now
+test what their names say: TERM reaches a child that is already ignoring
+TERM.
+
+`build-manifest.sha256` (sha256
+`9228414352a56e0465e896b81643cdce000bcedba70f86adac07fc50cfadad2d`) pins
+`fake-pi.mjs` after the patch. `build.patch` sha256 is
+`04234ce1d886e36dfd06cbd81153b38cbb86909b6ee933151306b8cdedd629d9`. In a
+fresh worktree at `521597bb` the patch applies and the manifest checks 1/1.
+
+## Mutants
+
+Both ran with `TMPDIR=/mnt/storage/scratch/tmp`, the condition that fails.
+
+| Mutant | K1/K3/K10 | File |
+|---|---|---|
+| M1: resolve at spawn, no wait (the old behavior) | 0/3 | `runs/mutant-m1-nowait.txt` |
+| M2: wait for ready, but the child has no TERM handler | 0/3, the same three assertions | `runs/mutant-m2-noignore.txt` |
+
+M1 shows the wait is what fixes it. M2 shows the assertions still catch a
+child that dies on TERM.
+
+## Runs
+
+The patch was applied in a scratch worktree at `521597bb`. Node v26.8.1.
+Start time and load are in `runs/start.txt`.
+
+| Run | TMPDIR | Result | File |
+|---|---|---|---|
+| `node --test "packages/conversation/tests/*.test.mjs"` | `/mnt/storage/scratch/tmp` | 152/152 | `runs/node-conversation.txt` |
+| `node --test "packages/webui/tests/*.test.mjs"` | `/mnt/storage/scratch/tmp` | 14/14 | `runs/node-webui.txt` |
+| K1/K3/K10 isolated, 3 consecutive | `/mnt/storage/scratch/tmp` | 3/3, 3/3, 3/3 | `runs/k-iso-{1,2,3}.txt` |
+| K1/K3/K10 isolated | `/tmp` | 3/3 | `runs/k-tmp.txt` |
+| K1/K3/K10 isolated | `~/darkwing-scratch/tmp` | 3/3 | `runs/k-home.txt` |
+| K1/K3/K10 isolated under 48 CPU burners, 3 runs (load 13.6 to 24.9) | `/mnt/storage/scratch/tmp` | 3/3, 3/3, 3/3 | `runs/k-load48-{1,2,3}.txt` |
+
+For the gate rerun, keep the default `TMPDIR=/mnt/storage/scratch/tmp`.
+That's the condition that failed, and a slower TMPDIR would pass with or
+without the patch.
+
+## Files
+
+- `build.md`, this file.
+- `build.patch`, `build-manifest.sha256`: the candidate.
+- `scope-receipt.mjs`, `receipts.jsonl`: the scope receipts.
+- `race.mjs`, `race.txt`: TERM timing outside a scope.
+- `fsync.mjs`, `fsync.txt`: write+fsync latency per TMPDIR.
+- `trace.patch`, `trace-fail.jsonl`, `trace-pass.jsonl`, `trace-load.jsonl`: the traced runs.
+- `runs/`: suite, isolated, load and mutant outputs, and the unfixed
+  canonical tree under three TMPDIRs.
diff --git a/agents/darkwing/work/cohort-k1/build.patch b/agents/darkwing/work/cohort-k1/build.patch
new file mode 100644
index 00000000..a08d24e6
--- /dev/null
+++ b/agents/darkwing/work/cohort-k1/build.patch
@@ -0,0 +1,67 @@
+diff --git a/packages/conversation/tests/fake-pi.mjs b/packages/conversation/tests/fake-pi.mjs
+index b3014f86..a78dfebd 100644
+--- a/packages/conversation/tests/fake-pi.mjs
++++ b/packages/conversation/tests/fake-pi.mjs
+@@ -615,14 +615,34 @@ const children = [];
+ // K2); `forkLoop` forks every 5 ms (K12); `ignoreTerm` survives SIGTERM, so
+ // only the kill phase ends it (K3, K10, K11). With `pidLog`, the fork loop
+ // appends each child's pid and a `term` line when it gets SIGTERM (K12).
++//
++// It resolves only once the child writes its ready byte, which it does after
++// installing its TERM handler. Node takes 15 to 80 ms to get there, and a
++// force stop can send TERM sooner (12 ms when the claim store is on a fast
++// disk). A TERM before the handler kills a child that is meant to ignore it
++// (#1528).
+ function spawnChild({ setsid = false, forkLoop = false, ignoreTerm = false, pidLog = null } = {}) {
+   const note = pidLog ? `const note=(s)=>require('node:fs').appendFileSync(${JSON.stringify(pidLog)},s+'\\n');` : "const note=()=>{};";
+-  const code = note + (ignoreTerm ? "process.on('SIGTERM',()=>note('term'));" : "") + (forkLoop
++  const code = note + (ignoreTerm ? "process.on('SIGTERM',()=>note('term'));" : "") + "process.stdout.write('r');" + (forkLoop
+     ? "const {spawn}=require('node:child_process');setInterval(()=>{try{const c=spawn('sleep',['1000'],{stdio:'ignore'});if(c.pid)note(String(c.pid))}catch{}},5);setInterval(()=>{},1e9)"
+     : "setInterval(()=>{},1e9)");
+-  const child = spawn(process.execPath, ["-e", code], { stdio: "ignore", detached: setsid });
++  const child = spawn(process.execPath, ["-e", code], { stdio: ["ignore", "pipe", "ignore"], detached: setsid });
+   children.push(child.pid);
+-  return child.pid;
++  return new Promise((resolve, reject) => {
++    const fail = (why) => {
++      clearTimeout(timer);
++      reject(new Error(`tool child ${child.pid} ${why} before it was ready`));
++    };
++    const timer = setTimeout(() => fail("took 10 s"), 10000);
++    child.once("error", (err) => fail(err.code ?? err.message));
++    child.once("exit", (code, signal) => fail(`exited (${signal ?? code})`));
++    child.stdout.once("data", () => {
++      clearTimeout(timer);
++      child.removeAllListeners("exit");
++      child.stdout.destroy();
++      resolve(child.pid);
++    });
++  });
+ }
+ 
+ // K13: a member writes its own pid to another cgroup's cgroup.procs.
+@@ -671,7 +691,7 @@ async function main() {
+         drop: () => fake.dropResponse(req.type, req.n ?? 1),
+         extension: () => void fake.extensionPrompt(req.args ?? {}),
+         state: () => ({ streaming: fake.streaming, runs: fake.runs.length, commands: fake.commands, pid: process.pid, children, appends: fake.appends }),
+-        child: () => ({ pid: spawnChild(req.args ?? {}) }),
++        child: () => spawnChild(req.args ?? {}).then((pid) => ({ pid })),
+         escape: () => escape(req.target),
+         cgroup: () => readFileSync(`/proc/${req.pid ?? process.pid}/cgroup`, "utf8"),
+         waitPaused: () => fake.waitPaused(req.point),
+@@ -679,12 +699,13 @@ async function main() {
+         stall: () => void process.stdin.pause(),
+       };
+       if (!ops[req.op]) return sock.write(encodeLine({ id: req.id, ok: false, error: `unknown op ${req.op}` }));
++      const failed = (err) => sock.write(encodeLine({ id: req.id, ok: false, error: String(err.message) }));
+       try {
+         const out = ops[req.op]();
+-        if (out && typeof out.then === "function") out.then(reply);
++        if (out && typeof out.then === "function") out.then(reply, failed);
+         else reply(out ?? null);
+       } catch (err) {
+-        sock.write(encodeLine({ id: req.id, ok: false, error: String(err.message) }));
++        failed(err);
+       }
+     });
+     sock.on("data", (c) => splitter.push(c));
diff --git a/agents/darkwing/work/cohort-k1/fsync.mjs b/agents/darkwing/work/cohort-k1/fsync.mjs
new file mode 100644
index 00000000..1a36dd34
--- /dev/null
+++ b/agents/darkwing/work/cohort-k1/fsync.mjs
@@ -0,0 +1,17 @@
+import { openSync, writeSync, fsyncSync, closeSync, rmSync, mkdtempSync } from "node:fs";
+import { join } from "node:path";
+for (const base of process.argv.slice(2)) {
+  const d = mkdtempSync(join(base, "dw-fsync-"));
+  const t = [];
+  for (let i = 0; i < 30; i++) {
+    const s = performance.now();
+    const fd = openSync(join(d, `f${i}`), "w");
+    writeSync(fd, "x".repeat(512));
+    fsyncSync(fd);
+    closeSync(fd);
+    t.push(performance.now() - s);
+  }
+  rmSync(d, { recursive: true });
+  t.sort((a, b) => a - b);
+  console.log(`${base}: write+fsync median ${t[15].toFixed(2)} ms, p90 ${t[27].toFixed(2)} ms`);
+}
diff --git a/agents/darkwing/work/cohort-k1/fsync.txt b/agents/darkwing/work/cohort-k1/fsync.txt
new file mode 100644
index 00000000..9493c8bc
--- /dev/null
+++ b/agents/darkwing/work/cohort-k1/fsync.txt
@@ -0,0 +1,3 @@
+/mnt/storage/scratch/tmp: write+fsync median 0.65 ms, p90 0.79 ms
+/tmp: write+fsync median 4.63 ms, p90 4.93 ms
+/home/jwoltje/darkwing-scratch/tmp: write+fsync median 4.69 ms, p90 9.30 ms
diff --git a/agents/darkwing/work/cohort-k1/race.mjs b/agents/darkwing/work/cohort-k1/race.mjs
new file mode 100644
index 00000000..0c010962
--- /dev/null
+++ b/agents/darkwing/work/cohort-k1/race.mjs
@@ -0,0 +1,17 @@
+// Spawn the K fixtures' ignoreTerm child exactly as fake-pi.mjs spawnChild does, then
+// SIGTERM it after a delay. Reports how the child ended within 1 s.
+import { spawn } from "node:child_process";
+const code = "const note=()=>{};process.on('SIGTERM',()=>note('term'));setInterval(()=>{},1e9)";
+const delays = process.argv.slice(2).map(Number);
+for (const d of delays) {
+  const r = { died: 0, survived: 0 };
+  for (let i = 0; i < 10; i++) {
+    const c = spawn(process.execPath, ["-e", code], { stdio: "ignore" });
+    const ended = new Promise((res) => c.on("exit", (code, sig) => res(sig ?? code)));
+    await new Promise((res) => setTimeout(res, d));
+    c.kill("SIGTERM");
+    const out = await Promise.race([ended, new Promise((res) => setTimeout(() => res(null), 1000))]);
+    if (out === null) { r.survived++; c.kill("SIGKILL"); await ended; } else r.died++;
+  }
+  console.log(`TERM ${d} ms after spawn: died ${r.died}/10 survived ${r.survived}/10`);
+}
diff --git a/agents/darkwing/work/cohort-k1/race.txt b/agents/darkwing/work/cohort-k1/race.txt
new file mode 100644
index 00000000..b6dd34ec
--- /dev/null
+++ b/agents/darkwing/work/cohort-k1/race.txt
@@ -0,0 +1,5 @@
+TERM 0 ms after spawn: died 10/10 survived 0/10
+TERM 10 ms after spawn: died 10/10 survived 0/10
+TERM 20 ms after spawn: died 10/10 survived 0/10
+TERM 30 ms after spawn: died 0/10 survived 10/10
+TERM 60 ms after spawn: died 0/10 survived 10/10
diff --git a/agents/darkwing/work/cohort-k1/receipts.jsonl b/agents/darkwing/work/cohort-k1/receipts.jsonl
new file mode 100644
index 00000000..ac6bbc5b
--- /dev/null
+++ b/agents/darkwing/work/cohort-k1/receipts.jsonl
@@ -0,0 +1,15 @@
+{"mode":"race","delayMs":12,"readyMs":null,"termMs":23,"child":3662788,"self":3662760,"show":["Id=dw-r46-race-12-3662746-0.scope","LoadState=loaded","ActiveState=active","SubState=running","InvocationID=2eac4fa367504b9dbca66a4693cc328a","ControlGroup=/user.slice/user-1000.slice/user@1000.service/app.slice/dw-r46-race-12-3662746-0.scope","Delegate=yes"],"before":[3662760,3662788],"after":[3662760],"childInBefore":true,"childInAfter":false,"exit":{"code":null,"signal":"SIGTERM","atMs":24}}
+{"mode":"race","delayMs":12,"readyMs":null,"termMs":20,"child":3663479,"self":3663212,"show":["Id=dw-r46-race-12-3662746-1.scope","LoadState=loaded","ActiveState=active","SubState=running","InvocationID=021c6d466fc64961ba3031a0254c3803","ControlGroup=/user.slice/user-1000.slice/user@1000.service/app.slice/dw-r46-race-12-3662746-1.scope","Delegate=yes"],"before":[3663212,3663479],"after":[3663212],"childInBefore":true,"childInAfter":false,"exit":{"code":null,"signal":"SIGTERM","atMs":21}}
+{"mode":"race","delayMs":12,"readyMs":null,"termMs":25,"child":3663799,"self":3663588,"show":["Id=dw-r46-race-12-3662746-2.scope","LoadState=loaded","ActiveState=active","SubState=running","InvocationID=ce8e2c2dbbe7481885a50152fe3766b5","ControlGroup=/user.slice/user-1000.slice/user@1000.service/app.slice/dw-r46-race-12-3662746-2.scope","Delegate=yes"],"before":[3663588,3663799],"after":[3663588],"childInBefore":true,"childInAfter":false,"exit":{"code":null,"signal":"SIGTERM","atMs":27}}
+{"mode":"race","delayMs":12,"readyMs":null,"termMs":20,"child":3664563,"self":3664322,"show":["Id=dw-r46-race-12-3662746-3.scope","LoadState=loaded","ActiveState=active","SubState=running","InvocationID=cc912ab9a7fe47dd9e3b97486abf0bc3","ControlGroup=/user.slice/user-1000.slice/user@1000.service/app.slice/dw-r46-race-12-3662746-3.scope","Delegate=yes"],"before":[3664322,3664563],"after":[3664322,3664563],"childInBefore":true,"childInAfter":true,"exit":"alive 500 ms after TERM"}
+{"mode":"race","delayMs":12,"readyMs":null,"termMs":21,"child":3665177,"self":3665003,"show":["Id=dw-r46-race-12-3662746-4.scope","LoadState=loaded","ActiveState=active","SubState=running","InvocationID=163271c658cc4ee4b84f5aace54bc806","ControlGroup=/user.slice/user-1000.slice/user@1000.service/app.slice/dw-r46-race-12-3662746-4.scope","Delegate=yes"],"before":[3665003,3665177],"after":[3665003],"childInBefore":true,"childInAfter":false,"exit":{"code":null,"signal":"SIGTERM","atMs":22}}
+{"mode":"race","delayMs":60,"readyMs":null,"termMs":69,"child":3665812,"self":3665626,"show":["Id=dw-r46-race-60-3665599-0.scope","LoadState=loaded","ActiveState=active","SubState=running","InvocationID=14681de5ac844879bdfcbcdd3dae8f10","ControlGroup=/user.slice/user-1000.slice/user@1000.service/app.slice/dw-r46-race-60-3665599-0.scope","Delegate=yes"],"before":[3665626,3665812],"after":[3665626,3665812],"childInBefore":true,"childInAfter":true,"exit":"alive 500 ms after TERM"}
+{"mode":"race","delayMs":60,"readyMs":null,"termMs":71,"child":3666377,"self":3666179,"show":["Id=dw-r46-race-60-3665599-1.scope","LoadState=loaded","ActiveState=active","SubState=running","InvocationID=3128eba3ed234776ae4a61cb12fe1210","ControlGroup=/user.slice/user-1000.slice/user@1000.service/app.slice/dw-r46-race-60-3665599-1.scope","Delegate=yes"],"before":[3666179,3666377],"after":[3666179,3666377],"childInBefore":true,"childInAfter":true,"exit":"alive 500 ms after TERM"}
+{"mode":"race","delayMs":60,"readyMs":null,"termMs":70,"child":3666924,"self":3666728,"show":["Id=dw-r46-race-60-3665599-2.scope","LoadState=loaded","ActiveState=active","SubState=running","InvocationID=836de499898d4b6996739e1b2a433fa0","ControlGroup=/user.slice/user-1000.slice/user@1000.service/app.slice/dw-r46-race-60-3665599-2.scope","Delegate=yes"],"before":[3666728,3666924],"after":[3666728,3666924],"childInBefore":true,"childInAfter":true,"exit":"alive 500 ms after TERM"}
+{"mode":"race","delayMs":60,"readyMs":null,"termMs":69,"child":3667387,"self":3667251,"show":["Id=dw-r46-race-60-3665599-3.scope","LoadState=loaded","ActiveState=active","SubState=running","InvocationID=0ebf8d9d930a43629668e10c08f80e0d","ControlGroup=/user.slice/user-1000.slice/user@1000.service/app.slice/dw-r46-race-60-3665599-3.scope","Delegate=yes"],"before":[3667251,3667387],"after":[3667251,3667387],"childInBefore":true,"childInAfter":true,"exit":"alive 500 ms after TERM"}
+{"mode":"race","delayMs":60,"readyMs":null,"termMs":70,"child":3667888,"self":3667727,"show":["Id=dw-r46-race-60-3665599-4.scope","LoadState=loaded","ActiveState=active","SubState=running","InvocationID=9c3594ae3018458594bb3ff996dc0d9a","ControlGroup=/user.slice/user-1000.slice/user@1000.service/app.slice/dw-r46-race-60-3665599-4.scope","Delegate=yes"],"before":[3667727,3667888],"after":[3667727,3667888],"childInBefore":true,"childInAfter":true,"exit":"alive 500 ms after TERM"}
+{"mode":"ready","delayMs":0,"readyMs":30,"termMs":38,"child":3668171,"self":3668085,"show":["Id=dw-r46-ready-0-3668072-0.scope","LoadState=loaded","ActiveState=active","SubState=running","InvocationID=4c2c3b3ad52a477e8f735abedf158cbb","ControlGroup=/user.slice/user-1000.slice/user@1000.service/app.slice/dw-r46-ready-0-3668072-0.scope","Delegate=yes"],"before":[3668085,3668171],"after":[3668085,3668171],"childInBefore":true,"childInAfter":true,"exit":"alive 500 ms after TERM"}
+{"mode":"ready","delayMs":0,"readyMs":22,"termMs":29,"child":3668354,"self":3668284,"show":["Id=dw-r46-ready-0-3668072-1.scope","LoadState=loaded","ActiveState=active","SubState=running","InvocationID=b9da06280a8a4c6682f05a2d4ff118cf","ControlGroup=/user.slice/user-1000.slice/user@1000.service/app.slice/dw-r46-ready-0-3668072-1.scope","Delegate=yes"],"before":[3668284,3668354],"after":[3668284,3668354],"childInBefore":true,"childInAfter":true,"exit":"alive 500 ms after TERM"}
+{"mode":"ready","delayMs":0,"readyMs":22,"termMs":28,"child":3668425,"self":3668417,"show":["Id=dw-r46-ready-0-3668072-2.scope","LoadState=loaded","ActiveState=active","SubState=running","InvocationID=aab0b83d085e4bac86fdbe1ce65f23dc","ControlGroup=/user.slice/user-1000.slice/user@1000.service/app.slice/dw-r46-ready-0-3668072-2.scope","Delegate=yes"],"before":[3668417,3668425],"after":[3668417,3668425],"childInBefore":true,"childInAfter":true,"exit":"alive 500 ms after TERM"}
+{"mode":"ready","delayMs":0,"readyMs":23,"termMs":30,"child":3668509,"self":3668482,"show":["Id=dw-r46-ready-0-3668072-3.scope","LoadState=loaded","ActiveState=active","SubState=running","InvocationID=d076a3b629554b83bded41cb00e667b8","ControlGroup=/user.slice/user-1000.slice/user@1000.service/app.slice/dw-r46-ready-0-3668072-3.scope","Delegate=yes"],"before":[3668482,3668509],"after":[3668482,3668509],"childInBefore":true,"childInAfter":true,"exit":"alive 500 ms after TERM"}
+{"mode":"ready","delayMs":0,"readyMs":23,"termMs":30,"child":3668635,"self":3668624,"show":["Id=dw-r46-ready-0-3668072-4.scope","LoadState=loaded","ActiveState=active","SubState=running","InvocationID=6b46a0b279ca454eaa034d48a4de7385","ControlGroup=/user.slice/user-1000.slice/user@1000.service/app.slice/dw-r46-ready-0-3668072-4.scope","Delegate=yes"],"before":[3668624,3668635],"after":[3668624,3668635],"childInBefore":true,"childInAfter":true,"exit":"alive 500 ms after TERM"}
diff --git a/agents/darkwing/work/cohort-k1/runs/canon-hometmp.txt b/agents/darkwing/work/cohort-k1/runs/canon-hometmp.txt
new file mode 100644
index 00000000..14c1658e
--- /dev/null
+++ b/agents/darkwing/work/cohort-k1/runs/canon-hometmp.txt
@@ -0,0 +1,11 @@
+✔ K1: force stop kills a tool child that called setsid; stopped with a verified proof (2737.880671ms)
+✔ K3: SIGTERM acknowledged while a member lives: stopping until the kill phase, never stopped from TERM (2557.042479ms)
+✔ K10: controller killed between the TERM and kill phases: restart checks the invocation ID and re-runs from TERM for the same stop (861.841994ms)
+ℹ tests 3
+ℹ suites 0
+ℹ pass 3
+ℹ fail 0
+ℹ cancelled 0
+ℹ skipped 0
+ℹ todo 0
+ℹ duration_ms 6282.04986
diff --git a/agents/darkwing/work/cohort-k1/runs/canon-scratchtmp.txt b/agents/darkwing/work/cohort-k1/runs/canon-scratchtmp.txt
new file mode 100644
index 00000000..3d05fb7f
--- /dev/null
+++ b/agents/darkwing/work/cohort-k1/runs/canon-scratchtmp.txt
@@ -0,0 +1,56 @@
+✖ K1: force stop kills a tool child that called setsid; stopped with a verified proof (2537.385038ms)
+✖ K3: SIGTERM acknowledged while a member lives: stopping until the kill phase, never stopped from TERM (2331.351365ms)
+✖ K10: controller killed between the TERM and kill phases: restart checks the invocation ID and re-runs from TERM for the same stop (209.932151ms)
+ℹ tests 3
+ℹ suites 0
+ℹ pass 0
+ℹ fail 3
+ℹ cancelled 0
+ℹ skipped 0
+ℹ todo 0
+ℹ duration_ms 5448.48373
+
+✖ failing tests:
+
+test at packages/conversation/tests/cohort.test.mjs:139:1
+✖ K1: force stop kills a tool child that called setsid; stopped with a verified proof (2537.385038ms)
+  AssertionError [ERR_ASSERTION]: the escaped child is a listed member
+      at TestContext.<anonymous> (file:///mnt/storage/src/mosaic-stack/packages/conversation/tests/cohort.test.mjs:151:12)
+      at async Test.run (node:internal/test_runner/test:1409:7)
+      at async startSubtestAfterBootstrap (node:internal/test_runner/harness:387:3) {
+    generatedMessage: false,
+    code: 'ERR_ASSERTION',
+    actual: false,
+    expected: true,
+    operator: '==',
+    diff: 'simple'
+  }
+
+test at packages/conversation/tests/cohort.test.mjs:176:1
+✖ K3: SIGTERM acknowledged while a member lives: stopping until the kill phase, never stopped from TERM (2331.351365ms)
+  AssertionError [ERR_ASSERTION]: the member ignored TERM
+      at TestContext.<anonymous> (file:///mnt/storage/src/mosaic-stack/packages/conversation/tests/cohort.test.mjs:190:12)
+      at async Test.run (node:internal/test_runner/test:1409:7)
+      at async Test.processPendingSubtests (node:internal/test_runner/test:974:7) {
+    generatedMessage: false,
+    code: 'ERR_ASSERTION',
+    actual: false,
+    expected: true,
+    operator: '==',
+    diff: 'simple'
+  }
+
+test at packages/conversation/tests/cohort.test.mjs:426:3
+✖ K10: controller killed between the TERM and kill phases: restart checks the invocation ID and re-runs from TERM for the same stop (209.932151ms)
+  AssertionError [ERR_ASSERTION]: the member is alive across the crash
+      at TestContext.<anonymous> (file:///mnt/storage/src/mosaic-stack/packages/conversation/tests/cohort.test.mjs:431:12)
+      at process.processTicksAndRejections (node:internal/process/task_queues:104:5)
+      at async Test.run (node:internal/test_runner/test:1409:7)
+      at async Test.processPendingSubtests (node:internal/test_runner/test:974:7) {
+    generatedMessage: false,
+    code: 'ERR_ASSERTION',
+    actual: false,
+    expected: true,
+    operator: '==',
+    diff: 'simple'
+  }
diff --git a/agents/darkwing/work/cohort-k1/runs/canon-tmp.txt b/agents/darkwing/work/cohort-k1/runs/canon-tmp.txt
new file mode 100644
index 00000000..bf67fb0e
--- /dev/null
+++ b/agents/darkwing/work/cohort-k1/runs/canon-tmp.txt
@@ -0,0 +1,11 @@
+✔ K1: force stop kills a tool child that called setsid; stopped with a verified proof (2360.366213ms)
+✔ K3: SIGTERM acknowledged while a member lives: stopping until the kill phase, never stopped from TERM (2364.75763ms)
+✔ K10: controller killed between the TERM and kill phases: restart checks the invocation ID and re-runs from TERM for the same stop (628.04725ms)
+ℹ tests 3
+ℹ suites 0
+ℹ pass 3
+ℹ fail 0
+ℹ cancelled 0
+ℹ skipped 0
+ℹ todo 0
+ℹ duration_ms 5474.064409
diff --git a/agents/darkwing/work/cohort-k1/runs/k-home.txt b/agents/darkwing/work/cohort-k1/runs/k-home.txt
new file mode 100644
index 00000000..e395bc9e
--- /dev/null
+++ b/agents/darkwing/work/cohort-k1/runs/k-home.txt
@@ -0,0 +1,11 @@
+✔ K1: force stop kills a tool child that called setsid; stopped with a verified proof (2457.36226ms)
+✔ K3: SIGTERM acknowledged while a member lives: stopping until the kill phase, never stopped from TERM (2375.081486ms)
+✔ K10: controller killed between the TERM and kill phases: restart checks the invocation ID and re-runs from TERM for the same stop (636.350971ms)
+ℹ tests 3
+ℹ suites 0
+ℹ pass 3
+ℹ fail 0
+ℹ cancelled 0
+ℹ skipped 0
+ℹ todo 0
+ℹ duration_ms 5607.100296
diff --git a/agents/darkwing/work/cohort-k1/runs/k-iso-1.txt b/agents/darkwing/work/cohort-k1/runs/k-iso-1.txt
new file mode 100644
index 00000000..2e6a37bd
--- /dev/null
+++ b/agents/darkwing/work/cohort-k1/runs/k-iso-1.txt
@@ -0,0 +1,11 @@
+✔ K1: force stop kills a tool child that called setsid; stopped with a verified proof (2665.443725ms)
+✔ K3: SIGTERM acknowledged while a member lives: stopping until the kill phase, never stopped from TERM (2531.922418ms)
+✔ K10: controller killed between the TERM and kill phases: restart checks the invocation ID and re-runs from TERM for the same stop (706.098022ms)
+ℹ tests 3
+ℹ suites 0
+ℹ pass 3
+ℹ fail 0
+ℹ cancelled 0
+ℹ skipped 0
+ℹ todo 0
+ℹ duration_ms 6068.030335
diff --git a/agents/darkwing/work/cohort-k1/runs/k-iso-2.txt b/agents/darkwing/work/cohort-k1/runs/k-iso-2.txt
new file mode 100644
index 00000000..8a36a1b4
--- /dev/null
+++ b/agents/darkwing/work/cohort-k1/runs/k-iso-2.txt
@@ -0,0 +1,11 @@
+✔ K1: force stop kills a tool child that called setsid; stopped with a verified proof (2699.60543ms)
+✔ K3: SIGTERM acknowledged while a member lives: stopping until the kill phase, never stopped from TERM (2492.169051ms)
+✔ K10: controller killed between the TERM and kill phases: restart checks the invocation ID and re-runs from TERM for the same stop (675.081525ms)
+ℹ tests 3
+ℹ suites 0
+ℹ pass 3
+ℹ fail 0
+ℹ cancelled 0
+ℹ skipped 0
+ℹ todo 0
+ℹ duration_ms 6026.119198
diff --git a/agents/darkwing/work/cohort-k1/runs/k-iso-3.txt b/agents/darkwing/work/cohort-k1/runs/k-iso-3.txt
new file mode 100644
index 00000000..7c5ec5a2
--- /dev/null
+++ b/agents/darkwing/work/cohort-k1/runs/k-iso-3.txt
@@ -0,0 +1,11 @@
+✔ K1: force stop kills a tool child that called setsid; stopped with a verified proof (2762.539396ms)
+✔ K3: SIGTERM acknowledged while a member lives: stopping until the kill phase, never stopped from TERM (2528.214494ms)
+✔ K10: controller killed between the TERM and kill phases: restart checks the invocation ID and re-runs from TERM for the same stop (644.633095ms)
+ℹ tests 3
+ℹ suites 0
+ℹ pass 3
+ℹ fail 0
+ℹ cancelled 0
+ℹ skipped 0
+ℹ todo 0
+ℹ duration_ms 6115.728995
diff --git a/agents/darkwing/work/cohort-k1/runs/k-load48-1.txt b/agents/darkwing/work/cohort-k1/runs/k-load48-1.txt
new file mode 100644
index 00000000..e326f17c
--- /dev/null
+++ b/agents/darkwing/work/cohort-k1/runs/k-load48-1.txt
@@ -0,0 +1,11 @@
+✔ K1: force stop kills a tool child that called setsid; stopped with a verified proof (2887.135899ms)
+✔ K3: SIGTERM acknowledged while a member lives: stopping until the kill phase, never stopped from TERM (2915.708256ms)
+✔ K10: controller killed between the TERM and kill phases: restart checks the invocation ID and re-runs from TERM for the same stop (2590.181146ms)
+ℹ tests 3
+ℹ suites 0
+ℹ pass 3
+ℹ fail 0
+ℹ cancelled 0
+ℹ skipped 0
+ℹ todo 0
+ℹ duration_ms 9662.912642
diff --git a/agents/darkwing/work/cohort-k1/runs/k-load48-2.txt b/agents/darkwing/work/cohort-k1/runs/k-load48-2.txt
new file mode 100644
index 00000000..60b044e1
--- /dev/null
+++ b/agents/darkwing/work/cohort-k1/runs/k-load48-2.txt
@@ -0,0 +1,11 @@
+✔ K1: force stop kills a tool child that called setsid; stopped with a verified proof (3084.73509ms)
+✔ K3: SIGTERM acknowledged while a member lives: stopping until the kill phase, never stopped from TERM (2750.8295ms)
+✔ K10: controller killed between the TERM and kill phases: restart checks the invocation ID and re-runs from TERM for the same stop (2151.224665ms)
+ℹ tests 3
+ℹ suites 0
+ℹ pass 3
+ℹ fail 0
+ℹ cancelled 0
+ℹ skipped 0
+ℹ todo 0
+ℹ duration_ms 8355.450647
diff --git a/agents/darkwing/work/cohort-k1/runs/k-load48-3.txt b/agents/darkwing/work/cohort-k1/runs/k-load48-3.txt
new file mode 100644
index 00000000..9fabf7ce
--- /dev/null
+++ b/agents/darkwing/work/cohort-k1/runs/k-load48-3.txt
@@ -0,0 +1,11 @@
+✔ K1: force stop kills a tool child that called setsid; stopped with a verified proof (2746.07054ms)
+✔ K3: SIGTERM acknowledged while a member lives: stopping until the kill phase, never stopped from TERM (2559.848734ms)
+✔ K10: controller killed between the TERM and kill phases: restart checks the invocation ID and re-runs from TERM for the same stop (1985.055632ms)
+ℹ tests 3
+ℹ suites 0
+ℹ pass 3
+ℹ fail 0
+ℹ cancelled 0
+ℹ skipped 0
+ℹ todo 0
+ℹ duration_ms 7722.015242
diff --git a/agents/darkwing/work/cohort-k1/runs/k-tmp.txt b/agents/darkwing/work/cohort-k1/runs/k-tmp.txt
new file mode 100644
index 00000000..d3f98b3b
--- /dev/null
+++ b/agents/darkwing/work/cohort-k1/runs/k-tmp.txt
@@ -0,0 +1,11 @@
+✔ K1: force stop kills a tool child that called setsid; stopped with a verified proof (2785.421246ms)
+✔ K3: SIGTERM acknowledged while a member lives: stopping until the kill phase, never stopped from TERM (2619.007617ms)
+✔ K10: controller killed between the TERM and kill phases: restart checks the invocation ID and re-runs from TERM for the same stop (889.082424ms)
+ℹ tests 3
+ℹ suites 0
+ℹ pass 3
+ℹ fail 0
+ℹ cancelled 0
+ℹ skipped 0
+ℹ todo 0
+ℹ duration_ms 6776.303473
diff --git a/agents/darkwing/work/cohort-k1/runs/mutant-m1-nowait.txt b/agents/darkwing/work/cohort-k1/runs/mutant-m1-nowait.txt
new file mode 100644
index 00000000..8ccbd1a4
--- /dev/null
+++ b/agents/darkwing/work/cohort-k1/runs/mutant-m1-nowait.txt
@@ -0,0 +1,56 @@
+✖ K1: force stop kills a tool child that called setsid; stopped with a verified proof (2523.134497ms)
+✖ K3: SIGTERM acknowledged while a member lives: stopping until the kill phase, never stopped from TERM (2421.121319ms)
+✖ K10: controller killed between the TERM and kill phases: restart checks the invocation ID and re-runs from TERM for the same stop (211.187938ms)
+ℹ tests 3
+ℹ suites 0
+ℹ pass 0
+ℹ fail 3
+ℹ cancelled 0
+ℹ skipped 0
+ℹ todo 0
+ℹ duration_ms 5461.571354
+
+✖ failing tests:
+
+test at cohort.test.mjs:139:1
+✖ K1: force stop kills a tool child that called setsid; stopped with a verified proof (2523.134497ms)
+  AssertionError [ERR_ASSERTION]: the escaped child is a listed member
+      at TestContext.<anonymous> (file:///home/jwoltje/darkwing-scratch/r46/fix/packages/conversation/tests/cohort.test.mjs:151:12)
+      at async Test.run (node:internal/test_runner/test:1409:7)
+      at async startSubtestAfterBootstrap (node:internal/test_runner/harness:387:3) {
+    generatedMessage: false,
+    code: 'ERR_ASSERTION',
+    actual: false,
+    expected: true,
+    operator: '==',
+    diff: 'simple'
+  }
+
+test at cohort.test.mjs:176:1
+✖ K3: SIGTERM acknowledged while a member lives: stopping until the kill phase, never stopped from TERM (2421.121319ms)
+  AssertionError [ERR_ASSERTION]: the member ignored TERM
+      at TestContext.<anonymous> (file:///home/jwoltje/darkwing-scratch/r46/fix/packages/conversation/tests/cohort.test.mjs:190:12)
+      at async Test.run (node:internal/test_runner/test:1409:7)
+      at async Test.processPendingSubtests (node:internal/test_runner/test:974:7) {
+    generatedMessage: false,
+    code: 'ERR_ASSERTION',
+    actual: false,
+    expected: true,
+    operator: '==',
+    diff: 'simple'
+  }
+
+test at cohort.test.mjs:426:3
+✖ K10: controller killed between the TERM and kill phases: restart checks the invocation ID and re-runs from TERM for the same stop (211.187938ms)
+  AssertionError [ERR_ASSERTION]: the member is alive across the crash
+      at TestContext.<anonymous> (file:///home/jwoltje/darkwing-scratch/r46/fix/packages/conversation/tests/cohort.test.mjs:431:12)
+      at process.processTicksAndRejections (node:internal/process/task_queues:104:5)
+      at async Test.run (node:internal/test_runner/test:1409:7)
+      at async Test.processPendingSubtests (node:internal/test_runner/test:974:7) {
+    generatedMessage: false,
+    code: 'ERR_ASSERTION',
+    actual: false,
+    expected: true,
+    operator: '==',
+    diff: 'simple'
+  }
diff --git a/agents/darkwing/work/cohort-k1/runs/mutant-m2-noignore.txt b/agents/darkwing/work/cohort-k1/runs/mutant-m2-noignore.txt
new file mode 100644
index 00000000..1023720c
--- /dev/null
+++ b/agents/darkwing/work/cohort-k1/runs/mutant-m2-noignore.txt
@@ -0,0 +1,56 @@
+✖ K1: force stop kills a tool child that called setsid; stopped with a verified proof (2545.15719ms)
+✖ K3: SIGTERM acknowledged while a member lives: stopping until the kill phase, never stopped from TERM (2407.231229ms)
+✖ K10: controller killed between the TERM and kill phases: restart checks the invocation ID and re-runs from TERM for the same stop (304.986006ms)
+ℹ tests 3
+ℹ suites 0
+ℹ pass 0
+ℹ fail 3
+ℹ cancelled 0
+ℹ skipped 0
+ℹ todo 0
+ℹ duration_ms 5605.846956
+
+✖ failing tests:
+
+test at cohort.test.mjs:139:1
+✖ K1: force stop kills a tool child that called setsid; stopped with a verified proof (2545.15719ms)
+  AssertionError [ERR_ASSERTION]: the escaped child is a listed member
+      at TestContext.<anonymous> (file:///home/jwoltje/darkwing-scratch/r46/fix/packages/conversation/tests/cohort.test.mjs:151:12)
+      at async Test.run (node:internal/test_runner/test:1409:7)
+      at async startSubtestAfterBootstrap (node:internal/test_runner/harness:387:3) {
+    generatedMessage: false,
+    code: 'ERR_ASSERTION',
+    actual: false,
+    expected: true,
+    operator: '==',
+    diff: 'simple'
+  }
+
+test at cohort.test.mjs:176:1
+✖ K3: SIGTERM acknowledged while a member lives: stopping until the kill phase, never stopped from TERM (2407.231229ms)
+  AssertionError [ERR_ASSERTION]: the member ignored TERM
+      at TestContext.<anonymous> (file:///home/jwoltje/darkwing-scratch/r46/fix/packages/conversation/tests/cohort.test.mjs:190:12)
+      at async Test.run (node:internal/test_runner/test:1409:7)
+      at async Test.processPendingSubtests (node:internal/test_runner/test:974:7) {
+    generatedMessage: false,
+    code: 'ERR_ASSERTION',
+    actual: false,
+    expected: true,
+    operator: '==',
+    diff: 'simple'
+  }
+
+test at cohort.test.mjs:426:3
+✖ K10: controller killed between the TERM and kill phases: restart checks the invocation ID and re-runs from TERM for the same stop (304.986006ms)
+  AssertionError [ERR_ASSERTION]: the member is alive across the crash
+      at TestContext.<anonymous> (file:///home/jwoltje/darkwing-scratch/r46/fix/packages/conversation/tests/cohort.test.mjs:431:12)
+      at process.processTicksAndRejections (node:internal/process/task_queues:104:5)
+      at async Test.run (node:internal/test_runner/test:1409:7)
+      at async Test.processPendingSubtests (node:internal/test_runner/test:974:7) {
+    generatedMessage: false,
+    code: 'ERR_ASSERTION',
+    actual: false,
+    expected: true,
+    operator: '==',
+    diff: 'simple'
+  }
diff --git a/agents/darkwing/work/cohort-k1/runs/node-conversation.txt b/agents/darkwing/work/cohort-k1/runs/node-conversation.txt
new file mode 100644
index 00000000..3c83d777
--- /dev/null
+++ b/agents/darkwing/work/cohort-k1/runs/node-conversation.txt
@@ -0,0 +1,160 @@
+✔ W1: two processes acquire the same pair at once; exactly one claim (124.186492ms)
+✔ W1: two writers publish the same revision at once: one wins, the other gets null, the winner's record stays (11.494379ms)
+✔ W1: a revision name appears only after its bytes are synced; before that, only a temp file exists (5.019078ms)
+✔ W2: acquire while a claim is reserved or active refuses already-active (169.129732ms)
+✔ W3: acquire while stopping, uncertain, or stopped without proof refuses unsafe-replacement (231.756886ms)
+✔ W4: same session with another seat tuple, and the reverse, both refuse; a loser on the seat key closes it no-unit (192.859955ms)
+✔ W4: a hard link of one session under another seat is the same session: the second controller refuses already-active and launches nothing (35.003128ms)
+✔ W4: a copy of one session under another seat is the same session: the second controller refuses already-active and launches nothing (21.132326ms)
+✔ W4: a session header ID that changes after construction refuses target; nothing is claimed or launched (3.242382ms)
+✔ W5: SIGKILL between every publication barrier of acquire and transition; restart never finds two holders or a lost claim (5566.910492ms)
+✔ W5: SIGKILL between every publication barrier of release; restart finishes or holds the release (22659.492505ms)
+✔ W6: controller killed mid-turn while the engine lives; restart is uncertain, no launch, prompts refuse (201.806859ms)
+✔ W12: a live owner paused with SIGSTOP; a second controller refuses already-active and changes nothing (116.242029ms)
+✔ W13: crash after the engine spawns, before active; restart finds the live unit: uncertain, no second spawn, force stop only (262.226787ms)
+✔ W14: crash after reservation, before the spawn marker: stopped with a no-unit observation; the pair is free (220.425841ms)
+✔ W20: crash after the spawn marker, scope collected; uncertain in both runs, the marker is copied, no launch until a boot proof (240.127173ms)
+✔ W15: crash between the two keys during release; restart finishes it under the same claim ID (35.945246ms)
+✔ W7: recorded boot ID differs on the same machine: stopped with a boot proof; open tool calls become uncertain (98.424488ms)
+✔ W8: resume after a proven stop with the same pins: new claim ID, generation +1, same conversation, branch and leaf (32.141383ms)
+✔ W9: resume with a changed binary, argv digest, branch or leaf is refused and the claim is unchanged (89.672997ms)
+✔ W11: the controller writes no session file; only the fake engine's own appends appear (23.121134ms)
+✔ W16: a highest revision that won't parse holds the pair uncertain; the older stopped revision is not reused (54.682806ms)
+✔ W17: a claim root copied from another host refuses foreign-host and promotes nothing (57.719055ms)
+✔ G1: a session path or claim root under .pi/state, ~/.claude, the data root or a registration refuses at construction (4.12463ms)
+✔ G2: a symlink inside the fixture root to a live session file is refused by the real-path check (1.12384ms)
+✔ G3: a fixture path swapped for a live path after construction is refused at bind (1.84306ms)
+✔ K1: force stop kills a tool child that called setsid; stopped with a verified proof (2507.919568ms)
+✔ K2: K1 on the process-group fallback ends uncertain, never stopped (153.327228ms)
+✔ K3: SIGTERM acknowledged while a member lives: stopping until the kill phase, never stopped from TERM (2414.676654ms)
+✔ K4: two engines; force stop one; the other survives by independent observation (4314.515513ms)
+✔ K5: a stop during a tool call leaves the effect uncertain, and it is shown (2190.378919ms)
+✔ K12: a member forking in a loop: the freeze stops it, enumeration is complete, populated 0 after cgroup.kill (2244.796524ms)
+✔ K13: a member writing its pid into another cgroup is refused by the namespace; the kill is complete (2189.63935ms)
+✔ K15: the shim gone, engine/cgroup.events unreadable, or the engine cgroup missing: evidence unavailable, not empty; uncertain (4473.315326ms)
+✔ K10: controller killed between the TERM and kill phases: restart checks the invocation ID and re-runs from TERM for the same stop (482.430287ms)
+✔ K11: controller killed after the confirmation is recorded, before TERM: restart checks the invocation ID and re-runs from TERM for the same stop (408.721794ms)
+✔ K14: a unit with the recorded name but another invocation ID: evidence unavailable, no signals, uncertain (307.075836ms)
+✔ K6: recover without proof, without confirmation, or with changed pins is refused (71.309069ms)
+✔ K7: recover after proof, then launch: new claim and execution, generation +1, same leaf; the cancelled prompt is not replayed (35.403696ms)
+✔ K8: an engine that loads another leaf on resume is refused before admission; it stays claimed until a proven stop (45.424183ms)
+✔ K9: an interrupt that never settles stays uncertain; force stop stays available; takeover is refused while fenced (3030.941578ms)
+✔ K16: a claim from another machine ID refuses foreign-host; no boot proof is issued (5.325961ms)
+✔ K17: two launcher calls with one eligibility record: one launch, the other refuses, no second engine (30.688596ms)
+✔ K18: the leaf changes after eligibility: launch refused; the reservation stays until released with proof (24.893734ms)
+✔ S1: `/goal x`, with leading spaces or a tab, refuses text-policy at admission; zero engine bytes (34.176579ms)
+✔ S2: every prefix pinned Pi interprets is refused, from the list the code uses; the rest reach the engine exactly (30.425031ms)
+✔ S3: `/goal` on the second line is pinned from the source: Pi checks only index 0, so it is admitted and sent exactly (27.293519ms)
+✔ S4: a `/` left in the composer is cleared when control transfers and returns; the next submit sends only the new text (42.046162ms)
+✔ S5: an observer terminal gets a paste then Enter, as send-message.sh does: not admitted: controller, nothing sent (21.340651ms)
+✔ S6: a mediated-shaped registration (no tmux) passed to the board's replyToRow: 409 no tmux session; exec never runs (1.34914ms)
+✔ S7: ESC, bracketed-paste markers and U+2028/U+2029 travel as one JSON string; the engine receives the exact text in one record (29.201111ms)
+✔ P3: a Pi confirm, select, input or editor dialog is shown disabled with a reason and never answered (138.365864ms)
+✔ E1: send, ack, user, toolCall, toolResult, final answer: shown once, no refresh, draft and reading position kept (39.366805ms)
+✔ E2: U+2028, U+2029 inside JSON strings and CRLF line ends each parse as one record, on the splitter and through the controller (21.443107ms)
+✔ E3: a multipart final, two blocks, null request correlation and duplicate delivery (31.257304ms)
+✔ E4: a page read after message_end but before its entry is persisted: marker at the seam, re-read after run-settled, each message once (26.594189ms)
+✔ E4: a gap or a new epoch also reconciles; nothing is concatenated across a gap (11.181347ms)
+✔ E5: an unknown native event gives no client event; evidence records its type and bytes; the terminal count goes up (26.220793ms)
+✔ E6: a tool result delayed across a pause and a reconnect is reconciled without a manual refresh (42.195378ms)
+✔ E7: the terminal renders the same stream as the library client, as observer and then as controller, and submits only as controller (41.055698ms)
+✔ terminal: engine control characters are made visible; a lost connection refuses submit (28.737455ms)
+✔ terminal: outcome unknown is shown as such, with no resend offer, and nothing is resent (0.53917ms)
+✔ terminal: text after Enter in the same input chunk starts the next message; it never joins the one submitted (0.351376ms)
+✔ terminal: a paste-start marker split right after its ESC still opens the paste; the Enter inside it never submits (0.356358ms)
+✔ terminal: invisible and bidi characters are made visible; head, status and notice lines stay one line (0.168609ms)
+✔ every record these fixtures produced is a valid CHAT-01 record (E5: no record fails the schema) (359.398761ms)
+✔ H1: two takeovers with the same expected generation: one wins, +1; the other refuses generation (56.47649ms)
+✔ H2: the old controller's prompt after a takeover commits is refused with zero engine bytes (79.112044ms)
+✔ H3: a takeover while a prompt holds the dispatch lock: written under the old actor, or refused; never both (131.150736ms)
+✔ H4: self-takeover is refused (22.440288ms)
+✔ H9: Interrupt racing a prompt's dispatch: before the write, dispatch-refused and no-turn; after, §3 rules (87.314186ms)
+✔ H10: Interrupt and force stop together: one stop chain, force stop supersedes (104.583327ms)
+✔ H10: an overlap during the pause before the abort: no abort, the stop ends uncertain (35.050855ms)
+✔ H10: a no-turn Interrupt lifts only its own fence; admission stays closed under force stop, overlap or revocation (70.09079ms)
+✔ H11: the controller disconnects mid-turn: work continues, the claim is unchanged, control stays put (129.262166ms)
+✔ H12: an exact retry after reconnecting to the same incarnation returns the same receipt; one dispatch (15.147609ms)
+✔ H13: a retry with the same request ID and different text is refused (13.200342ms)
+✔ H14: late stdout from the old engine after a replacement is dropped by incarnation, counted, never rendered (133.123623ms)
+✔ H15: a revoked connection's command is refused; the revocation fence holds (65.378107ms)
+✔ H16: a second controller for the same session refuses already-active; the first is untouched (16.417034ms)
+✔ H10: a second force stop while the first escalation runs refuses fenced; one escalation, and the claim records only the first stop's phases (64.083554ms)
+✔ H17: a confirmation reused, answered from another connection, or used after the stop changed is refused (56.969236ms)
+✔ H18: two prompts before any native output: the second refuses busy; one engine write (15.033626ms)
+✔ H19: the pipe fails mid-line under a large prompt: delivery-unknown transport-unknown, poisoned, no later write (119.397422ms)
+✔ H19: the link itself never writes again after an unknown outcome, whoever calls it (0.606652ms)
+✔ H19: the controller dies mid-write of a large line: after restart the outcome is unknown and nothing is resent (464.542066ms)
+✔ H20: the line is written but the ack is lost when the controller dies: orphan, outcome unknown, nothing resent (357.812591ms)
+✔ H21: a retry of the exact request with the old token after a crash is stale-incarnation; no second write (337.123938ms)
+✔ H22: after H21 and a valid recovery, a new request with the new token is admitted (2377.836435ms)
+✔ H23: requests pending at a restart are not resent; each shows outcome unknown (482.017907ms)
+✔ a plain conversation: catalogue row, one page, CHAT-01 records (10.196509ms)
+✔ native entries map to blocks: tools, thinking, bash, notices, ids that do not fit (3.091521ms)
+✔ F1: a malformed line is an unavailable part at its position, and reading continues (2.999666ms)
+✔ F1: a missing parent stops the history with a notice that names the unreadable lines (3.746417ms)
+✔ F1: an unreadable fork is never merged into another branch's history (3.733154ms)
+✔ F1: a follow stays on its branch when the next entry's parent is unreadable (3.881773ms)
+✔ F1: a file whose entries are all unreadable shows a notice per line (1.563335ms)
+✔ F2: a truncated trailing line marks the view incomplete, not an error (2.494119ms)
+✔ pagination: 100 parts, then the rest; parts concatenate to the whole branch (5.109673ms)
+✔ F3: a replaced file (new inode) refuses old cursors with reconcile (4.939351ms)
+✔ F4: a same-inode rewrite of the prefix refuses old cursors with reconcile (5.516645ms)
+✔ F5: growth between pages keeps the epoch and the page stops at the pinned length (5.793786ms)
+✔ F6: unknown, foreign and expired cursors refuse and leave the cursor usable (10.497498ms)
+✔ F7: a symlinked file and a symlinked directory component are refused, never opened (9.313922ms)
+✔ F8: a file swapped for a symlink after the catalogue is refused (2.247728ms)
+✔ F9: registrations never add or redirect a root (2.060491ms)
+✔ F10: a header cwd naming another project is refused (3.630852ms)
+✔ F11: parentSession renders with a marker and the parent is never opened (0.936984ms)
+✔ F12: two leaves: the default leaf is shown and the other branch reads alone (4.789444ms)
+✔ F12: a follow refuses when an appended duplicate id changes the branch's earlier parts (2.415895ms)
+✔ F12: a second root (Pi's resetLeaf) starts its own branch (1.349225ms)
+✔ F13: compaction is a marker in place, then the retained content (0.756245ms)
+✔ F14: long strings split into fragments and parts, reassemble exactly, and pages respect the byte cap (737.947726ms)
+✔ fragments never cut a surrogate pair and keep an empty string (9.768434ms)
+✔ F15: a Claude seat is an unsupported-harness placeholder whose directory is never read (2.629953ms)
+✔ unknown conversations, empty files and non-Pi files refuse (2.988026ms)
+✔ an unreadable file or root inside the roots is refused per row, not a failed catalogue (1.388415ms)
+✔ a seat directory without search permission refuses that root, not the catalogue (2.248255ms)
+✔ every page and cursor is a valid CHAT-01 record (847.042088ms)
+✔ the engine pin holds for the installed package (2.933293ms)
+✔ pinned Pi, sealed and without credentials, answers the controller's commands with the shapes the fake models (364.994239ms)
+✔ pinned Pi appends thinking_level_change at start when the branch lacks one, so the leaf moves (K8 then fails closed) (307.845583ms)
+✔ N25: ordinary Interrupt reconciles; a non-empty queue_update in the window is O5 (80.815781ms)
+✔ N1: an extension's follow-up queued after the fence is cleared before any abort; O5, Unknown (57.148386ms)
+✔ N1: a follow-up queued before the fence is O5 at once; the Interrupt refuses fenced (24.835014ms)
+✔ N2: with abort first, the fake runs the external item (the ordering guard has teeth) (21.576912ms)
+✔ N3: the fence lands in preflight, preflight errors, no run: failed, No run, uncertain (42.350718ms)
+✔ N4: the ack arrives after the first abort and a run starts: clear and abort again; Interrupted (37.456929ms)
+✔ N5: an input handler takes the prompt: ack, no run, delivery-unknown handled-without-run (119.71406ms)
+✔ N6: an extension queues between clear_queue and abort: O5 and O6, Unknown (46.194593ms)
+✔ N7: clear_queue times out: no abort, nativeQueue unknown, force stop still ends it (1530.004862ms)
+✔ N7: clear_queue answers an error: no abort, nativeQueue unknown, the link not poisoned (15.860593ms)
+✔ N8: an extension prompt starts a run during Mosaic preflight; the losing settle is O3 (71.692215ms)
+✔ N9: a run that started before the fence and ends aborted: failed interrupted, Interrupted (16.241237ms)
+✔ N9: decision 34: a run that ends aborted with no stop in progress: aborted-without-stop, uncertain, outcome unknown (16.048665ms)
+✔ N9: an aborted that lands after the fence but before any abort is written: aborted-without-stop, Unknown (32.548668ms)
+✔ N10: fake conformance (30.957332ms)
+✔ N11: the run fails before any user message_start: delivery-unknown ack-without-start, never failed (29.834953ms)
+✔ N12: input that starts a run after the final empty clear is O1 and not part of the stop's proof (19.905915ms)
+✔ N13: agent_start with no slot held is O1; a later prompt refuses with zero engine bytes (66.348845ms)
+✔ N14: the run completes while clear_queue is in flight: finished, Completed first, uncertain (26.705932ms)
+✔ N14: the run completes after the abort is written, before Pi applies it: finished, never relabelled (25.622164ms)
+✔ N15: the fence lands in preflight, then an input handler takes it: handled-without-run, No run (19.804122ms)
+✔ N16: Interrupt with no slot and no run refuses no-turn: no stop, no bytes, admission open (13.437887ms)
+✔ N17: the run fails on its own during the exchange: failed, Failed on its own (28.095743ms)
+✔ N18: no final assistant message_end, or a lost line: working stays working; before working, transport-unknown (113.466843ms)
+✔ N19: a losing extension prompt settles inside the Mosaic run before its user message: O3, run-overlap (134.279618ms)
+✔ N20: an extension triggerTurn during Mosaic preflight starts first; while streaming it queues with no signal (83.211293ms)
+✔ N21: a losing settle after the receipt settled finished is O2; the receipt stays finished (14.999139ms)
+✔ N22: an agent-level custom message is dropped by the clear with no signal; evidence names the seal (13.807672ms)
+✔ N23: a nextTurn message survives clear and abort and attaches to the next prompt, with no signal (13.596018ms)
+✔ N24: the seal is an allow-list: --extension, a missing --no-* flag, a second --mode or --session, a session or output flag, or a stray word refuses unsealed-engine; no engine starts (37.274093ms)
+ℹ tests 152
+ℹ suites 0
+ℹ pass 152
+ℹ fail 0
+ℹ cancelled 0
+ℹ skipped 0
+ℹ todo 0
+ℹ duration_ms 32488.500969
diff --git a/agents/darkwing/work/cohort-k1/runs/node-webui.txt b/agents/darkwing/work/cohort-k1/runs/node-webui.txt
new file mode 100644
index 00000000..0b15de44
--- /dev/null
+++ b/agents/darkwing/work/cohort-k1/runs/node-webui.txt
@@ -0,0 +1,23 @@
+✔ browser edge states: loading, empty, malformed, stale, hostile/long values, in-flight reply and appearance fallback (2364.731167ms)
+Rendered contrast: {"failures":[],"count":330,"lowest":4.504658476260286}
+✔ served Console browser: real board fixtures, keyboard, drafts, receipts, themes, 320px and failures (2725.60223ms)
+✔ conversation view: full history, collapsed tools, hidden thinking, inert hostile content, malformed and reconcile markers (2335.250549ms)
+✔ conversation view: a fork keeps the open branch, says so, and opens the new one on request (1375.477504ms)
+✔ conversation view: a newer session with no readable history keeps the marker (1002.908949ms)
+✔ conversation view: seats without history say so and offer no reply (608.42244ms)
+✔ Discord row through real board/WebUI: independent brake/liveness, no Reply, literal content (1957.413637ms)
+✔ return flow through the conversation view: send, tool call, delayed result, peer message, exact long answers, relaunch (53771.943793ms)
+✔ both presentations replace old activity with relaunch notice, label retained history, then resume after new activity (1987.210959ms)
+✔ reported return flow and relative Age: reply sent from the inspector, then the new answer appears there without manual refresh (21912.250845ms)
+✔ loopback host and board origin fail closed (7.055591ms)
+✔ real board fixture passes through WebUI; assets and isolated seen/reply work (100.024626ms)
+✔ proxy preserves exact request bytes, status and receipt, rejects forms and malformed JSON, never follows redirect (227.262245ms)
+✔ unreachable board reports URL; CLI rejects unsupported options (1632.267153ms)
+ℹ tests 14
+ℹ suites 0
+ℹ pass 14
+ℹ fail 0
+ℹ cancelled 0
+ℹ skipped 0
+ℹ todo 0
+ℹ duration_ms 54170.048795
diff --git a/agents/darkwing/work/cohort-k1/runs/start.txt b/agents/darkwing/work/cohort-k1/runs/start.txt
new file mode 100644
index 00000000..5b2ba015
--- /dev/null
+++ b/agents/darkwing/work/cohort-k1/runs/start.txt
@@ -0,0 +1,2 @@
+2026-10-09T13:05:51Z
+ 08:05:51 up 33 days,  9:40,  5 users,  load average: 4.03, 7.84, 5.58
diff --git a/agents/darkwing/work/cohort-k1/scope-receipt.mjs b/agents/darkwing/work/cohort-k1/scope-receipt.mjs
new file mode 100644
index 00000000..37da621e
--- /dev/null
+++ b/agents/darkwing/work/cohort-k1/scope-receipt.mjs
@@ -0,0 +1,61 @@
+// Row 46 receipt probe. Runs the fixture's ignoreTerm child inside a
+// delegated systemd user scope, sends it SIGTERM, and records the scope's
+// `systemctl --user show`, `cgroup.procs` before and after TERM, and the
+// child's exit code and signal.
+//
+//   node scope-receipt.mjs <mode> <delayMs> <runs>
+//
+// mode `race`: TERM goes `delayMs` after spawn, as the fixture does today.
+// mode `ready`: TERM goes `delayMs` after the child reports its handler is
+// installed, as the fixed fixture does.
+// The outer process launches one scope per run; the inner process
+// (`--inner`) is the scope's main process and prints one JSON line.
+
+import { spawn, spawnSync } from "node:child_process";
+import { readFileSync } from "node:fs";
+
+const sleep = (ms) => new Promise((r) => setTimeout(r, ms));
+
+// The fixture's child code for { ignoreTerm: true } with no pidLog
+// (packages/conversation/tests/fake-pi.mjs, spawnChild), plus a readiness
+// byte on stdout in `ready` mode.
+const childCode = (ready) =>
+  "const note=()=>{};process.on('SIGTERM',()=>note('term'));" +
+  (ready ? "process.stdout.write('r');" : "") +
+  "setInterval(()=>{},1e9)";
+
+const procs = (cg) => readFileSync(`/sys/fs/cgroup${cg}/cgroup.procs`, "utf8").split("\n").filter(Boolean).map(Number);
+
+async function inner(mode, delayMs, unit) {
+  const cg = readFileSync("/proc/self/cgroup", "utf8").trim().split("::")[1];
+  const ready = mode === "ready";
+  const t0 = performance.now();
+  const child = spawn(process.execPath, ["-e", childCode(ready)], { stdio: ["ignore", ready ? "pipe" : "ignore", "ignore"] });
+  const exited = new Promise((r) => child.on("exit", (code, signal) => r({ code, signal, atMs: Math.round(performance.now() - t0) })));
+  let readyMs = null;
+  if (ready) {
+    await new Promise((r) => child.stdout.once("data", r));
+    readyMs = Math.round(performance.now() - t0);
+  }
+  await sleep(delayMs);
+  const show = spawnSync("systemctl", ["--user", "show", "-p", "Id,LoadState,ActiveState,SubState,InvocationID,ControlGroup,Delegate", `${unit}.scope`], { encoding: "utf8" }).stdout.trim().split("\n");
+  const before = procs(cg);
+  const termMs = Math.round(performance.now() - t0);
+  child.kill("SIGTERM");
+  const exit = await Promise.race([exited, sleep(500).then(() => null)]);
+  const after = procs(cg);
+  if (!exit) child.kill("SIGKILL");
+  console.log(JSON.stringify({ mode, delayMs, readyMs, termMs, child: child.pid, self: process.pid, show, before, after, childInBefore: before.includes(child.pid), childInAfter: after.includes(child.pid), exit: exit ?? "alive 500 ms after TERM" }));
+}
+
+async function outer(mode, delayMs, runs) {
+  for (let i = 0; i < runs; i++) {
+    const unit = `dw-r46-${mode}-${delayMs}-${process.pid}-${i}`;
+    const r = spawnSync("systemd-run", ["--user", "--scope", "--quiet", "-p", "Delegate=yes", `--unit=${unit}`, "--", process.execPath, import.meta.filename, "--inner", mode, String(delayMs), unit], { encoding: "utf8" });
+    process.stdout.write(r.stdout || `{"unit":"${unit}","status":${r.status},"stderr":${JSON.stringify(r.stderr)}}\n`);
+  }
+}
+
+const a = process.argv.slice(2);
+if (a[0] === "--inner") await inner(a[1], Number(a[2]), a[3]);
+else await outer(a[0], Number(a[1]), Number(a[2] ?? 5));
diff --git a/agents/darkwing/work/cohort-k1/trace-fail.jsonl b/agents/darkwing/work/cohort-k1/trace-fail.jsonl
new file mode 100644
index 00000000..6216bd3a
--- /dev/null
+++ b/agents/darkwing/work/cohort-k1/trace-fail.jsonl
@@ -0,0 +1,9 @@
+{"t":1791551027129,"ev":"spawn","pid":3646877,"ignoreTerm":true,"setsid":true}
+{"t":1791551027142,"ev":"term","pid":3646862}
+{"t":1791551027142,"ev":"term","pid":3646877}
+{"t":1791551029516,"ev":"spawn","pid":3647263,"ignoreTerm":true,"setsid":false}
+{"t":1791551029528,"ev":"term","pid":3647248}
+{"t":1791551029528,"ev":"term","pid":3647263}
+{"t":1791551031873,"ev":"spawn","pid":3647581,"ignoreTerm":true,"setsid":false}
+{"t":1791551031886,"ev":"term","pid":3647556}
+{"t":1791551031887,"ev":"term","pid":3647581}
diff --git a/agents/darkwing/work/cohort-k1/trace-load.jsonl b/agents/darkwing/work/cohort-k1/trace-load.jsonl
new file mode 100644
index 00000000..3a1d8054
--- /dev/null
+++ b/agents/darkwing/work/cohort-k1/trace-load.jsonl
@@ -0,0 +1,13 @@
+{"t":1791550812775,"ev":"spawn","pid":3607494,"ignoreTerm":true,"setsid":true}
+{"t":1791550812853,"ev":"ready","pid":3607494}
+{"t":1791550812878,"ev":"term","pid":3607446}
+{"t":1791550812878,"ev":"term","pid":3607494}
+{"t":1791550815693,"ev":"spawn","pid":3607807,"ignoreTerm":true,"setsid":false}
+{"t":1791550815773,"ev":"ready","pid":3607807}
+{"t":1791550815779,"ev":"term","pid":3607781}
+{"t":1791550815780,"ev":"term","pid":3607807}
+{"t":1791550819446,"ev":"spawn","pid":3608344,"ignoreTerm":true,"setsid":false}
+{"t":1791550819489,"ev":"ready","pid":3608344}
+{"t":1791550819556,"ev":"term","pid":3608301}
+{"t":1791550819556,"ev":"term","pid":3608344}
+{"t":1791550820058,"ev":"term","pid":3608344}
diff --git a/agents/darkwing/work/cohort-k1/trace-pass.jsonl b/agents/darkwing/work/cohort-k1/trace-pass.jsonl
new file mode 100644
index 00000000..06695715
--- /dev/null
+++ b/agents/darkwing/work/cohort-k1/trace-pass.jsonl
@@ -0,0 +1,13 @@
+{"t":1791550802745,"ev":"spawn","pid":3605642,"ignoreTerm":true,"setsid":true}
+{"t":1791550802763,"ev":"ready","pid":3605642}
+{"t":1791550802798,"ev":"term","pid":3605597}
+{"t":1791550802798,"ev":"term","pid":3605642}
+{"t":1791550805434,"ev":"spawn","pid":3606162,"ignoreTerm":true,"setsid":false}
+{"t":1791550805456,"ev":"ready","pid":3606162}
+{"t":1791550805492,"ev":"term","pid":3606153}
+{"t":1791550805492,"ev":"term","pid":3606162}
+{"t":1791550808090,"ev":"spawn","pid":3606502,"ignoreTerm":true,"setsid":false}
+{"t":1791550808106,"ev":"ready","pid":3606502}
+{"t":1791550808199,"ev":"term","pid":3606487}
+{"t":1791550808200,"ev":"term","pid":3606502}
+{"t":1791550808539,"ev":"term","pid":3606502}
diff --git a/agents/darkwing/work/cohort-k1/trace.patch b/agents/darkwing/work/cohort-k1/trace.patch
new file mode 100644
index 00000000..d1db1e6a
--- /dev/null
+++ b/agents/darkwing/work/cohort-k1/trace.patch
@@ -0,0 +1,43 @@
+diff --git a/packages/conversation/src/shim.mjs b/packages/conversation/src/shim.mjs
+index 2adbe48b..d51c4a1f 100644
+--- a/packages/conversation/src/shim.mjs
++++ b/packages/conversation/src/shim.mjs
+@@ -22,7 +22,7 @@
+ // `populated 0`. A missing or unreadable file is unavailable, never empty.
+ 
+ import { spawn } from "node:child_process";
+-import { closeSync, mkdirSync, readdirSync, readFileSync, unlinkSync, writeFileSync } from "node:fs";
++import { appendFileSync, closeSync, mkdirSync, readdirSync, readFileSync, unlinkSync, writeFileSync } from "node:fs";
+ import { createServer } from "node:net";
+ import { join } from "node:path";
+ import { LineSplitter, encodeLine, parseLine } from "./framing.mjs";
+@@ -136,6 +136,7 @@ async function handle(req) {
+         if (startOf(pid) !== startTicks) continue;
+         try {
+           process.kill(pid, "SIGTERM");
++          if (process.env.DW_TRACE) appendFileSync(process.env.DW_TRACE, JSON.stringify({ t: Date.now(), ev: 'term', pid }) + '\n');
+           signalled.push(pid);
+         } catch {
+           // gone already
+diff --git a/packages/conversation/tests/fake-pi.mjs b/packages/conversation/tests/fake-pi.mjs
+index b3014f86..f30f5a4c 100644
+--- a/packages/conversation/tests/fake-pi.mjs
++++ b/packages/conversation/tests/fake-pi.mjs
+@@ -615,13 +615,16 @@ const children = [];
+ // K2); `forkLoop` forks every 5 ms (K12); `ignoreTerm` survives SIGTERM, so
+ // only the kill phase ends it (K3, K10, K11). With `pidLog`, the fork loop
+ // appends each child's pid and a `term` line when it gets SIGTERM (K12).
++import * as __fs from 'node:fs';
++const require0 = () => __fs;
+ function spawnChild({ setsid = false, forkLoop = false, ignoreTerm = false, pidLog = null } = {}) {
+   const note = pidLog ? `const note=(s)=>require('node:fs').appendFileSync(${JSON.stringify(pidLog)},s+'\\n');` : "const note=()=>{};";
+-  const code = note + (ignoreTerm ? "process.on('SIGTERM',()=>note('term'));" : "") + (forkLoop
++  const code = note + (ignoreTerm ? "process.on('SIGTERM',()=>note('term'));" + (process.env.DW_TRACE ? `require('node:fs').appendFileSync(${JSON.stringify(process.env.DW_TRACE)},JSON.stringify({t:Date.now(),ev:'ready',pid:process.pid})+'\\n');` : "") : "") + (forkLoop
+     ? "const {spawn}=require('node:child_process');setInterval(()=>{try{const c=spawn('sleep',['1000'],{stdio:'ignore'});if(c.pid)note(String(c.pid))}catch{}},5);setInterval(()=>{},1e9)"
+     : "setInterval(()=>{},1e9)");
+   const child = spawn(process.execPath, ["-e", code], { stdio: "ignore", detached: setsid });
+   children.push(child.pid);
++  if (process.env.DW_TRACE) { require0().appendFileSync(process.env.DW_TRACE, JSON.stringify({ t: Date.now(), ev: 'spawn', pid: child.pid, ignoreTerm, setsid }) + '\n'); child.on('exit', (code, sig) => require0().appendFileSync(process.env.DW_TRACE, JSON.stringify({ t: Date.now(), ev: 'child-exit', pid: child.pid, code, sig }) + '\n')); }
+   return child.pid;
+ }
+