Heartbeat v0.2.0

Added

• Person and repository activity pages at /pow, combining GitHub, Nostr, and
  ngit activity with separate or combined heatmaps, year selection, and filters.
• Npub, nprofile, and NIP-05 input, with account discovery and proof indicators.
• Cached activity previews for shared links, plus relay fetch details.
• GitHub comments, reviews, and status changes; Nostr outbox relay discovery.
• Background backfills, historical caching, and hourly recovery of unfinished jobs.
• A dedicated PoW GitHub OAuth app and shared request budgets to isolate its quota
  from application and report submissions.
• JSON downloads of the current filtered view on Heartbeat and PoW, including
  source coverage and fetch status for PoW exports.
• GitLab, Forgejo, and plain git repository providers, including Tor network health
  and WireGuard repositories in the General Fund.

Changed

• Developer filters link to PoW; PoW defaults to a combined heatmap.
• Shared text filters through ?q= and consistent activity filter groups.
• Incremental timeline rendering keeps large feeds responsive.
• Dependabot account backfills are disabled; repository activity remains supported.

Fixed

• Reject commit search pages with unrelated authors before splitting or paginating,
  retaining collected activity and continuing with issues and reviews. Commit
  coverage remains explicitly incomplete when GitHub ignores the author filter.
• Follow repository redirects within GitHub's API and back off failed requests.
• Preserve Unicode characters when truncating cached activity text.
• Renew backfill queue retention and recover expired, unqueued, or partial months.