Mark 407e683e9b test(01-08): RED unit tests for remuxSegments — single-EBML + monotonic + frame-count + size + empty ...

- 5 RED tests pinning the contract for src/background/webm-remux.ts
  (created in Task 3). All fail with "module missing" today — the
  Task 3 GREEN gate.
- Test 1: exactly 1 EBML header + 1 Segment magic in output.
- Test 2: output size within [0.7x, 1.3x] of input sum.
- Test 3: ffprobe format=duration >= 25_000 ms (skip-if-no-ffprobe).
- Test 4: ffprobe -count_frames in [905, 912] (per-seg sum 912 ± 3 boundary
  partial-frame drops, I-01 tightening).
- Test 5: empty input -> empty Blob (defense-in-depth).
- Fixture sliced at d13-confirmed byte offsets (0 / 509038 / 970967);
  verified against committed last_30sec.webm at Task 2 land time.
- Baseline counts: 13 files / 62 tests / 7 failed (2 webm-playback +
  5 new webm-remux) | 55 passed. tsc exit 0.

2026-05-17 09:23:53 +02:00

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