- pill label now shows KB/s when degraded ('cdn 23 KB/s'); tap opens a
panel (replaces the transient toast) with origin/CDN state, KB/s,
a sparkline of the ~1h /api/cdn hist, and last-updated age
- 60s poll while the page is visible (was: load/play/failure only)
- playback failure overlay appends CDN context when degraded/down
- buffer gauge + spinner untouched: client buffer state, not CDN state
- server unchanged: /api/cdn already returned everything
- tests: 3 hermetic browser tests (mocked /api/cdn via page.route —
the throwaway server's probe runs live upstream, so its data is
mocked out of the assertions); 37 passed
- docs: README + SPEC synced