fix(sessions): scope the launch model to claude and pin it with the advisor (#514, #515, #530 landing)

Maintainer merge-time fixes for the three PRs that landed together on the
session create / launch / persistence path.

#514 findings (bot verdict merge-with-fixes):
- minor, fixed: SessionState.model was published and persisted for every
  mode, so a codex/opencode cron session reported the app-wide Claude
  default it never ran on. toState() now emits it only where the new
  cliTakesSessionModel() holds (registry capability model.source ===
  'claude-settings-file', no CLI id branch). POST /api/sessions uses the
  same helper for its non-claude refusal, so refusal and publication cannot
  drift. Recovery then hands back undefined for other modes on its own.
- nit, fixed: the `model` schema admitted a leading dash (and '.', '[').
  The first character must now be a letter or digit; still a subset of the
  registry's model-claude pattern, so nothing accepted is refused at launch.
- nit, fixed (reject, the consistent choice): `model` with
  attachRemoteSession was silently dropped. Now a 400 INVALID_INPUT, as
  #514 does for non-claude CLIs and quick-start does for remote cases.
  advisorModel (#530) gets the same refusal there. effort and envOverrides
  keep their older silent ignore on that branch so no existing caller breaks.

#515 finding (bot verdict merge, one nit):
- nit, fixed: the types/session.ts @fileoverview described CodexConfig as
  (model, resumeSessionId); it now lists reasoningEffort, bypass,
  animations and renderMode too.

Audit of the merged combination (not reviewed before):
- The conflict resolutions in session.ts (toState), types/session.ts,
  reboot-restore-routes.ts, server.ts (restoreMuxSessions), CLAUDE.md and
  skills/codeman/reference/endpoints.md (+ plugin mirror) keep both sides
  correctly; nothing was lost or doubled.
- A claude session with both `model` and `advisorModel` launches with
  `--model <id>` and ONE merged `--settings` JSON (ultracode + advisorModel,
  or advisorModel beside `--effort <level>`), on the tmux template
  (including the resume || new variant and with the statusLine exporter)
  and on the direct-PTY fallback. Both values (and effort) survive
  restoreMuxSessions onto a dead pane, a reboot restore into a fresh pane,
  and restartCli/dead-pane respawn via _buildRespawnPaneOptions.
- quick-start and ralph-loop take no per-session `model` (matching #514's
  scope, POST /api/sessions only) and launch on the app-wide default, which
  toState now persists for claude, so recovery stays consistent.
- No defect found in the combination beyond the findings above. Noted, not
  changed: advisorModel is still published for any mode a caller sends it
  with (launch-inert there; the UI and skill send it for claude only).

Tests: test/session-model-recovery.test.ts pins the pair through both
recovery shapes for effort ultracode/high/none, the recovery constructors'
fields, the tmux-manager builder hop, and the codex/opencode/shell
non-publication; test/advisor-model.test.ts pins the launch lines and a
real direct-PTY Session's pty.spawn argv; the route test covers flag-shaped
models, attach refusals and the published fields. Docs: SessionState.model
docstring, the reboot-restore-registry header, the golden test comment and
the CLAUDE.md model/advisor bullets.

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

test/cli-registry-spawn-golden.test.ts

@@ -56,9 +56,10 @@ describe('claude', () => {
   });
 
   it('renders a model as the quoted value of --model, even one that opens with a dash', () => {
-    // POST /api/sessions admits a leading '-' in `model`. It still lands as the option's
-    // value: quoted here, and Claude's option parser takes the word after `--model` as its
-    // value whatever it starts with, so it can never become a flag of its own.
+    // POST /api/sessions refuses a leading '-' in `model`, but the registry's `model-claude`
+    // pattern still admits one, so the builder must stay safe on its own: the value lands
+    // quoted, and Claude's option parser takes the word after `--model` as its value whatever
+    // it starts with, so it can never become a flag of its own.
     expect(claude({ model: 'claude-fable-5-1' })).toBe(
       'claude --dangerously-skip-permissions --session-id "0f9c2b14-1111-2222-3333-444455556666" --model "claude-fable-5-1"'
     );