* Date fix: introduce GOODNEWS_TZ (goodnews/localtime.py) so the brief's "today"
rolls over in a pinned zone (Eastern) instead of UTC — robust to host-clock
resets. The home page now formats the brief's date in each VISITOR's local
timezone (from its UTC freshness stamp), so nobody ever sees "tomorrow."
* Admin "Content served": articles live, fresh (7d), ingested (24h), summaries,
active sources, today's brief size — queries.content_stats().
* Admin "Source health": per active source, the failure streak, last error,
accepted contribution, and computed next-poll time (so backoff / "resting
until" is visible), via queries.source_health() reusing the feeds backoff
math. Failing sources sort to the top; times render in the viewer's zone.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
