docs: mark IUH-M02 complete, start IUH-M03 (#432)

docs/scratchpads/install-ux-hardening-20260405.md

@@ -156,3 +156,45 @@ ASSUMPTION: The `hooks` subcommands under `config` operate on `~/.claude/hooks-c
 ASSUMPTION: For the hooks preview stage, the "name" field displayed per hook entry is the top-level event key (e.g. "PostToolUse") plus the matcher from nested hooks array. This is the most user-readable representation given the hooks-config.json structure.
 ASSUMPTION: `config hooks list/enable/disable` use `CLAUDE_HOME` env or `~/.claude` as the target directory for hooks files.
 ASSUMPTION: The headless TTY detection (`!process.stdin.isTTY`) is sufficient; `MOSAIC_ASSUME_YES=1` is an explicit override for cases where stdin is a TTY but the user still wants non-interactive (e.g., scripted installs with piped terminal).
+
+---
+
+## Session 4 — 2026-04-05 (orchestrator resume) — IUH-M02 closed, delegating IUH-M03
+
+### IUH-M02 completion summary
+
+- **PR:** #431 merged as `cd8b1f66`
+- **CI:** green (Woodpecker)
+- **Issue:** #426 closed
+- **Acceptance criteria:** AC-3 (password mask), AC-4 (hooks visibility — consent recorded), AC-5 (headless path) all satisfied
+- **New files:** `prompter/masked-prompt.ts`, `stages/hooks-preview.ts` (+ specs)
+- **Modified:** `wizard.ts`, `types.ts` (`state.hooks`), `commands/gateway/install.ts`, `commands/config.ts`
+
+### Follow-up captured from M02 agent
+
+**Hooks consent is recorded but not enforced.** The `hooks-preview` stage sets `state.hooks.accepted` when the user confirms, but the finalize stage still unconditionally runs `mosaic-link-runtime-assets`, which copies `hooks-config.json` into `~/.claude/` regardless of consent. This is a soft gap — the user sees the prompt and can decline, but declining currently has no effect downstream.
+
+Options for addressing:
+
+- Fold into IUH-M03 (since M03 touches the finalize/install convergence path anyway)
+- Spin a separate small follow-up issue after M03 lands
+
+Leaning toward folding into M03 — the unified first-run flow naturally reworks the finalize→gateway handoff where this gating belongs.
+
+### IUH-M03 delegation
+
+Now delegating to an **opus** subagent in an isolated worktree. Scope from `/tmp/iuh-m03-body.md`:
+
+- Extract `runConfigWizard` → `stages/gateway-config.ts`
+- Extract `bootstrapFirstUser` → `stages/gateway-bootstrap.ts`
+- `runWizard` invokes gateway stages as final stages
+- Drop the 10-minute `$XDG_RUNTIME_DIR/mosaic-install-state.json` session bridge
+- `mosaic gateway install` becomes a thin standalone wrapper for backward-compat
+- `tools/install.sh` single auto-launch entry point
+- **Bonus if scoped:** honor `state.hooks.accepted` in finalize stage so declining hooks actually skips hook install
+
+Known tooling caveats to pass to worker:
+
+- `issue-create.sh` / `pr-create.sh` wrappers eval multiline bodies as shell — use Gitea REST API fallback with `load_credentials gitea-mosaicstack`
+- Protected `main`: PR-only, squash merge
+- Must run `ci-queue-wait.sh --purpose push|merge` before push/merge