Closes#100.
Each Site runs its own Poll Lane: an independent goroutine with its own rest
and pace from the registry (`backend/internal/latest/sites.go`), replacing the
shared cooldown/interval/stagger/batch configuration. Rest (1h, all six Sites
including the browser trio) is enforced by the due query's WHERE clause; the
Lane sleeps its effective gap between fetches — the registry 10s, or
rest/eligible when a Site holds enough Series, floored at 1s with a
Site-naming warning when the floor engages.
Lane-local failure handling:
- Two challenge-held results stop that Site's Lane for 15m; the probes keep
their stamp, untried Series stay due.
- A lost browser sets a shared Poller flag: the other browser Lanes skip
their passes for the same 15m (no stamp-per-pass-per-Lane on a dead tab),
then decay and probe again.
- Browser wake gate preserved (5 due, or one waiting 15m, ADR-0005); one tab
shared by the three browser Sites; "browser lane behind by X" logged every
pass.
- Cover work (healing a stored source URL and filling a blank from the series
page) runs in the background so a slow CDN cannot consume a Lane's gap.
Removed: `LATEST_CHAPTER_POLL_{COOLDOWN,BROWSER_COOLDOWN,INTERVAL,BATCH,STAGGER}`
and the 6h browser rest. Only `LATEST_CHAPTER_POLL_ENABLED` remains; DEPLOY.md
documents the exact `.env` edit. ADR-0010 records the decisions.
Reviewed-on: #106
Co-authored-by: Sulthan Zaki <sultankiki05@gmail.com>
Co-committed-by: Sulthan Zaki <sultankiki05@gmail.com>
