Mark 923aaca3a8 test(smoke): add T+/wall timer overlay to smoke page for D-13 stale-gap measurement ...

The smoke test page now displays a fixed top-right overlay showing
elapsed-since-load (T+) and wall-clock (HH:MM:SS). Operator can:
- Note timer values at save-click moment
- Examine the saved WebM's last frame for the visible timer values
- Compute (save-click value − last-frame value) = operator-visible
  "stale gap" the D-13 architecture leaks

This converts the subjective "video isn't latest" observation into a
precise measurement, enabling correct routing:
- Gap ≤ 10s → matches D-13 in-flight-segment trade-off (architectural,
  not a regression; would inform a follow-up plan to reduce the gap)
- Gap > 10s → real regression (ring buffer rotation broken or similar)

Pure diagnostic addition to smoke.sh; no extension code changed.

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

2026-05-17 12:34:05 +02:00

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