docs: close out install-ux-hardening mission (#434)

docs/MISSION-MANIFEST.md

@@ -7,11 +7,11 @@
 
 **ID:** install-ux-hardening-20260405
 **Statement:** Close the remaining gaps in the Mosaic Stack first-run and teardown experience uncovered by the post-`cli-unification` audit. A user MUST be able to cleanly uninstall the stack; the wizard MUST make security-sensitive surfaces visible (hooks, password entry); and CI/headless installs MUST NOT hang on interactive prompts. The longer-term goal is a single cohesive first-run flow that collapses `mosaic wizard` and `mosaic gateway install` into one state-bridged experience.
-**Phase:** Execution
-**Current Milestone:** IUH-M03
-**Progress:** 2 / 3 milestones
-**Status:** active
-**Last Updated:** 2026-04-05
+**Phase:** Complete
+**Current Milestone:** —
+**Progress:** 3 / 3 milestones
+**Status:** complete
+**Last Updated:** 2026-04-05 (mission complete)
 **Parent Mission:** [cli-unification-20260404](./archive/missions/cli-unification-20260404/MISSION-MANIFEST.md) (complete)
 
 ## Context
@@ -23,18 +23,18 @@ Post-merge audit of `cli-unification-20260404` (AC-1, AC-6) validated that the f
 - [x] AC-1: `mosaic uninstall` (top-level) cleanly reverses every mutation made by `tools/install.sh` — framework data, npm CLI, nested stack deps, runtime asset injections in `~/.claude/`, npmrc scope mapping, PATH edits. Dry-run supported. `--keep-data` preserves memory + user files + gateway DB. (PR #429)
 - [x] AC-2: `curl … | bash -s -- --uninstall` works without requiring a functioning CLI. (PR #429)
 - [x] AC-3: Password entry in `bootstrapFirstUser` is masked (no plaintext echo); confirm prompt added. (PR #431)
-- [x] AC-4: Wizard has an explicit hooks stage that previews which hooks will be installed, asks for confirmation, and records the user's choice. `mosaic config hooks list|enable|disable` surface exists. (PR #431 — consent recorded in `state.hooks.accepted`; finalize-stage gating is a follow-up)
+- [x] AC-4: Wizard has an explicit hooks stage that previews which hooks will be installed, asks for confirmation, and records the user's choice. `mosaic config hooks list|enable|disable` surface exists. (PR #431 — consent; PR #433 — finalize-stage gating now honors `state.hooks.accepted === false` end-to-end)
 - [x] AC-5: `runConfigWizard` and `bootstrapFirstUser` accept a headless path (env vars + `--yes`) so `tools/install.sh --yes` + `MOSAIC_ASSUME_YES=1` completes end-to-end in CI without TTY. (PR #431)
-- [ ] AC-6: `mosaic wizard` and `mosaic gateway install` are collapsed into a single cohesive entry point with shared state (no two-phase handoff via the 10-minute session file).
-- [ ] AC-7: All milestones ship as merged PRs with green CI, closed issues, updated release notes.
+- [x] AC-6: `mosaic wizard` and `mosaic gateway install` are collapsed into a single cohesive entry point with shared state; gateway install is now terminal stages 11 & 12 of `runWizard`, session-file bridge removed, `mosaic gateway install` preserved as a thin standalone wrapper. (PR #433)
+- [x] AC-7: All milestones shipped as merged PRs with green CI and closed issues. (PRs #429, #431, #433)
 
 ## Milestones
 
-| #   | ID      | Name                                                      | Status      | Branch                  | Issue | Started    | Completed  |
-| --- | ------- | --------------------------------------------------------- | ----------- | ----------------------- | ----- | ---------- | ---------- |
-| 1   | IUH-M01 | `mosaic uninstall` — top-level teardown + shell wrapper   | done        | feat/mosaic-uninstall   | #425  | 2026-04-05 | 2026-04-05 |
-| 2   | IUH-M02 | Wizard remediation — hooks visibility, pwd mask, headless | done        | feat/wizard-remediation | #426  | 2026-04-05 | 2026-04-05 |
-| 3   | IUH-M03 | Unified first-run wizard (collapse wizard + gateway)      | in-progress | feat/unified-first-run  | #427  | 2026-04-05 | —          |
+| #   | ID      | Name                                                      | Status | Branch                  | Issue | Started    | Completed  |
+| --- | ------- | --------------------------------------------------------- | ------ | ----------------------- | ----- | ---------- | ---------- |
+| 1   | IUH-M01 | `mosaic uninstall` — top-level teardown + shell wrapper   | done   | feat/mosaic-uninstall   | #425  | 2026-04-05 | 2026-04-05 |
+| 2   | IUH-M02 | Wizard remediation — hooks visibility, pwd mask, headless | done   | feat/wizard-remediation | #426  | 2026-04-05 | 2026-04-05 |
+| 3   | IUH-M03 | Unified first-run wizard (collapse wizard + gateway)      | done   | feat/unified-first-run  | #427  | 2026-04-05 | 2026-04-05 |
 
 ## Subagent Delegation Plan