feat(01-14): monitorTypeSurfaces:'include' — narrow picker to monitor surfaces only

[per Plan 01-14; closes B-01-14-01 via Step 1b lockstep]

- src/offscreen/recorder.ts: add monitorTypeSurfaces:'include' as top-level
  DisplayMediaStreamOptions sibling of video: (W3C Screen Capture spec §6.1;
  Chrome >= 119; removes tab/window panes from the operator's picker per
  Plan 01-10 RESEARCH §5 + §Pitfall-5 recommendation). Typed widening cast
  extended in lockstep to keep the explicit-typing contract (no `as any`).
  D-15 post-grant validation block at recorder.ts:294 UNCHANGED — belt
  (picker narrowing) + suspenders (post-grant tear-down) chain preserved.

- tests/offscreen/display-surface-constraint.test.ts: lockstep update of
  the strict-deep-equality assertion at lines 223-226 with the same key
  ordering as the source change (video -> monitorTypeSurfaces -> audio).
  toHaveBeenCalledWith contract preserved (NO expect.objectContaining —
  the test author's "catches future drops of ANY field" discipline is
  honored). This edit + the source change land in the SAME commit so the
  98/98 baseline never crosses a commit boundary in RED state.

- src/test-hooks/offscreen-hooks.ts: capture last constraints object in
  module-scoped `lastGetDisplayMediaConstraints` cell (was `_constraints`
  received-but-unused; renamed to `constraints`); add `get-last-getDisplayMedia-constraints`
  bridge op to the __mokoshOffscreenQuery dispatcher between
  get-display-surface and get-segment-count. Defensive try/catch mirrors
  the existing dispatcher pattern; the cell is module-internal so the
  MokoshTestSurface cross-cast in types.ts requires NO change (decision
  documented inline in offscreen-hooks.ts).

- tests/uat/extension-page-harness.ts: add `assertA23` mirroring `assertA3`
  (bridge query → 2-check AssertionResult: non-null constraints + value).
  Extend the `Window.__mokoshHarness` declaration + runtime export + status
  bar text + console.log to reference A23.

- tests/uat/lib/harness-page-driver.ts: export `driveA23(page)` mirroring
  the `driveA14` page.evaluate wrapper shape. Standard read-only driver.

- tests/uat/harness.test.ts: extend FORBIDDEN_HOOK_STRINGS (line 85) with
  `lastGetDisplayMediaConstraints` and `get-last-getDisplayMedia-constraints`.
  Import driveA23. Append `{ name: 'A23', drive: driveA23 }` to the drivers
  array after the A14 entry. Update header comment + orchestrator stdout
  to reflect A14 + A23 chain. The `Total = drivers.length + 1` arithmetic
  adapts automatically: 14 + 1 = 15 → 15 + 1 = 16.

- tests/background/no-test-hooks-in-prod-bundle.test.ts: lockstep
  extension of FORBIDDEN_HOOK_STRINGS (line 105) with the same 2 strings.
  Header comment updated to "Total: 12 surface strings." (was 10).
  Confirms production `dist/` has ZERO occurrences after `npm run build`
  via the `__MOKOSH_UAT__` dead-branch tree-shake (T-01-14-04 mitigation).

D-01 (whole-desktop only via getDisplayMedia; reject window/tab surfaces) is
the design intent that monitorTypeSurfaces:'include' realizes at the picker-
UI level. D-15 post-grant validation (recorder.ts:294-307) remains the
actual enforcement against managed-policy/DevTools/older-Chrome overrides.

Verification chain (per Plan 01-14 §verify; clean post-commit):
- `npx tsc --noEmit` exit 0
- `npm run build` exit 0; dist/ produced, monitorTypeSurfaces ships in
  the offscreen chunk as the operator-facing picker hint
- `npm run build:test` exit 0; dist-test/ produced with the harness
  hooks intact (gated)
- `npm test` 100/100 GREEN (was 98/98; +2 via the 2 new FORBIDDEN_HOOK_STRINGS
  parametrized tests — both PASS, production bundle hook-free)
- `npm run test:uat` 16/16 GREEN (15 → 16 via A23). A23 reads constraints
  `{video: {...}, monitorTypeSurfaces: 'include', audio: false}` from the
  fakeGetDisplayMedia capture cell — round-trips through the full call site.
- Production bundle spot-check:
    `grep -rc 'lastGetDisplayMediaConstraints\|get-last-getDisplayMedia-constraints' dist/ | grep -v ':0$'`
    → empty (all `:0` filtered) → ZERO leakage.

References:
- W3C Screen Capture §6.1 DisplayMediaStreamOptions:
  https://www.w3.org/TR/screen-capture/#dom-displaymediastreamoptions-monitortypesurfaces
- Chrome screen-sharing-controls (Chrome 119+):
  https://developer.chrome.com/docs/web-platform/screen-sharing-controls
- Plan 01-10 RESEARCH §5 + §Pitfall-5 (recommendation provenance):
  .planning/phases/01-stabilize-video-pipeline/01-10-RESEARCH.md
- Architectural-note (replaces retired AMENDMENT-A.md improvisation per
  01-11-SUMMARY): canonical GSD ceremony — plan → checker (B-01-14-01)
  → executor → SUMMARY (this commit).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tests/offscreen/display-surface-constraint.test.ts

@@ -219,9 +219,13 @@ describe('Plan 01-09 D-15-display-surface: getDisplayMedia constraints + post-gr
 
     expect(getDisplayMediaSpy).toHaveBeenCalledTimes(1);
     // Strict deep-equality — NOT expect.objectContaining. Catches a
-    // future drop of either `displaySurface` or `cursor`.
+    // future drop of either `displaySurface` or `cursor` (D-15) OR
+    // the Plan 01-14 top-level `monitorTypeSurfaces: 'include'` picker-
+    // narrowing constraint. Key ordering matches the source call at
+    // src/offscreen/recorder.ts: video → monitorTypeSurfaces → audio.
     expect(getDisplayMediaSpy).toHaveBeenCalledWith({
       video: { displaySurface: 'monitor', cursor: 'always' },
+      monitorTypeSurfaces: 'include',
       audio: false,
     });
   });