docs(multi-user): document the settings read, system operations and own picks

- docs/api-reference.md: a non-admin's GET /api/settings omits
  voiceSettings.apiKey, caseOrder and lastUsedCase; a new "System
  operations" table for the admin-only routes and the scoped
  POST /api/auth/revoke; the error-code table now lists FORBIDDEN and the
  other multi-user codes (PASSWORD_CHANGE_REQUIRED, USER_NOT_FOUND,
  USER_EXISTS, LAST_ADMIN).
- docs/wiki/Multi-User-Mode.md: what a regular user reads, that their run
  mode and respawn presets stay theirs on the device, the slow sign-in
  case, and the admin-only system operations.
- docs/multi-user-plan.md: Settings and System ops rows marked implemented.
- CLAUDE.md: the Multi-user mode paragraph names the new pieces and tests.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

docs/multi-user-plan.md

@@ -161,8 +161,8 @@ Codeman now ships a global **Startup Mode** picker (App Settings, Claude CLI tab
 | Screenshots `/api/screenshots` (deprecated)                                | Deprecated: removed in a later MAJOR, so no per-user subdir is planned; the replacement `POST /api/sessions/:id/paste-image` is already session-scoped. Former plan: per-user subdir `~/.codeman/screenshots/<username>/` in multi-user mode. Note: `GET /:name` deliberately rejects `/` in names as traversal, so derive the subdir server-side from `req.authUser` and keep client-visible names flat                                                  |
 | Attachments                                                                | Already session-scoped; inherits the session owner check. `attachmentConfineToWorkspace` is a global, default-OFF setting today: in multi-user mode it is FORCED ON for non-admins regardless of the setting (their attachments must resolve inside their own space); the setting keeps meaning what it means for admins                                                                                                                                  |
 | File routes (browse/preview)                                               | Path allowlist adds: non-admin paths must resolve (realpath) inside their own space or their own sessions' workingDirs                                                                                                                                                                                                                                                                                                                                    |
-| Settings (`settings.json`)                                                 | Global, admin-only writes in multi-user mode; reads allowed (per-device display keys stay in localStorage as today). **Implemented (1.42.0):** `PUT /api/settings`, `PUT /api/execution/model-config`, `PUT /api/config` and `PUT /api/cases/order` answer 403 `FORBIDDEN` to a non-admin before parsing anything; quick-start and Ralph loop start skip a non-admin's `lastUsedCase`; the browser skips those writes for a non-admin (`_settingsReadOnly()`, settings-ui.js). Per-user server settings: out of scope v1|
-| System ops (self-update, tunnel toggle, span-displays, docker image build) | Admin-only                                                                                                                                                                                                                                                                                                                                                                                                                                                |
+| Settings (`settings.json`)                                                 | Global, admin-only writes in multi-user mode; reads allowed (per-device display keys stay in localStorage as today). **Implemented (1.42.0):** `PUT /api/settings`, `PUT /api/execution/model-config`, `PUT /api/config` and `PUT /api/cases/order` answer 403 `FORBIDDEN` to a non-admin before parsing anything; quick-start and Ralph loop start skip a non-admin's `lastUsedCase`; the browser skips those writes for a non-admin (`_settingsReadOnly()`, settings-ui.js) and keeps their own run mode and respawn presets on the device; a non-admin's `GET /api/settings` omits `voiceSettings.apiKey`, `caseOrder` and `lastUsedCase` (`settingsForNonAdmin`). Per-user server settings: out of scope v1|
+| System ops (self-update, tunnel toggle, span-displays, docker image build) | Admin-only. **Implemented (1.42.0):** `POST /api/system/update`, `/api/system/span-displays`, `/api/tunnel/qr/regenerate` and `/api/cleanup-state` answer 403 `FORBIDDEN` to a non-admin; a non-admin's `POST /api/auth/revoke` revokes only their own login sessions and `GET /api/tunnel/info` lists only those |
 | `getLightState` init snapshot                                              | Filtered per connection. Actual contents to filter (verified): `sessions`, `scheduledRuns`, `respawnStatus`, `subagents`, `workflowRuns`, `planUsage` (host-plan telemetry: admin-only); `globalStats` stays coarse-global. Cron jobs are NOT in the snapshot (they have their own REST route; filter there). The snapshot is cached process-wide (`LIGHT_STATE_CACHE_TTL_MS`): either key the cache per role/user or filter AFTER the cache on each send |
 
 ## 7. SSE Event Filtering