feat(01-09): GREEN — displaySurface:'monitor' constraint + post-grant validation
Plan 01-09 Task 2 GREEN — flips Task 1 tests 1, 2, 4 to GREEN:
1. CaptureErrorCode union extended with 'wrong-display-surface'.
2. classifyCaptureError branch matches 'wrong-display-surface' prefix.
3. getDisplayMedia call carries {video:{displaySurface:'monitor',
cursor:'always'},audio:false} (Plan 01-09 D-15-display-surface +
Phase 5 cursor:'always' opportunistic lift).
4. Post-grant validation block reads track.getSettings().displaySurface;
on non-monitor pick: tears down stream, nulls mediaStream, throws
wrong-display-surface Error which routes through the existing
classifyCaptureError + RECORDING_ERROR broadcast path.
Type note: lib.dom.d.ts MediaTrackConstraints omits 'cursor' — used
explicit type-widening cast (NOT 'as any') to add the field without
suppressing other type checking.
Tests: 4/4 GREEN; full suite 15 files / 68 tests / GREEN.
tsc --noEmit exit 0. npm run build exit 0.
Mark
de162b4293