Mark 503531485c feat(01-08): install ts-ebml + webm-muxer; pin SW-compat via deps test ...

- Add ts-ebml ^3.0.2 (parse half) and webm-muxer ^5.1.4 (write half) per
  CONTEXT.md amendment D-14-remux; both MIT, both verified SW-compatible
  in the d13 debug-session library survey.
- tests/background/webm-remux-deps.test.ts pins two contracts:
  (a) named exports surface (Muxer + ArrayBufferTarget + Decoder).
  (b) both libraries import cleanly when window/document are absent on
      globalThis — guards the published dist against accidentally
      acquiring DOM globals on the hot path that would crash the
      Chrome service-worker runtime.
- Note: webm-muxer 5.1.4 upstream-deprecated in favor of Mediabunny; the
  pinned version still meets the d13 architectural requirement
  (single-EBML output via addVideoChunkRaw). Migration to Mediabunny is
  out of scope for Plan 01-08 and would require a new ADR.
- Baseline 53 GREEN + 2 new GREEN; tsc clean; 2 webm-playback duration
  RED still pending (drive to GREEN in Tasks 3-5).

2026-05-17 09:22:46 +02:00

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