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governance: normalize ECP 0063-0078 and add ECP-0079

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every.channel 2026-02-27 23:34:35 -08:00
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evolution/proposals/ECP-0074-archive-hls-engine-selection.md
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# ECP-0074: Archive HLS Engine Selection For Chromium
Status: Implemented
## Context
Archive mode currently chooses native HLS whenever `video.canPlayType("application/vnd.apple.mpegurl")` is non-empty.
@ -16,6 +18,16 @@ Use native HLS only on Safari/iOS user agents. For all other browsers (including
- Keeps Safari native path where it is reliable.
- Preserves a single URL and UI flow (`/api/archive/.../master.m3u8`).
## Alternatives considered
- Keep `canPlayType` as the only gate. Rejected because Chromium reports support but fails event-style playback.
- Force `hls.js` for all browsers including Safari. Rejected because Safari native playback is already reliable and simpler.
## Rollout / teardown
- Deploy UA-gated engine selection in web app and validate archive playback on Chromium and Safari.
- Teardown by reverting to the previous generic `canPlayType` gate.
## Reversibility
Revert the UA gate and return to the previous `canPlayType`-only check.