fix: harden github activity recovery

[f0rr0]

What changed

• open a fresh PostgreSQL connection for every strict post-discovery audit
• retry inconclusive projection reads on a bounded 2s, 5s, and 10s schedule without weakening the audit
• emit only sanitized projection error name/code diagnostics
• bypass reachable-history walks when exact durable push evidence can be hydrated directly
• cap exact sequential recovery at 100 commits so a maximum-size stale push becomes an explicit gap instead of starving every worker run

Production evidence

• the August backfill completed discovery in 19 minutes with zero pending queues, then three projection reads on one long-lived client returned inconclusive
• replaying the exact failed snapshot succeeded with all 456 sources through both transaction and session poolers
• after exact webhook recovery, the strict August audit passes 459/459 with zero coverage gaps and every queue settled
• the live August 31 page renders 2 unique repository headers for 2 repositories and contains no merge milestones or PR-work labels

Verification

• 246 tests passed with 1,540 assertions
• typecheck, lint, formatting, production build, and diff check passed
• focused exact-push tests cover compare contradictions, 404 bypass, and over-cap rejection before commit hydration

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Project	Deployment	Actions	Updated (UTC)
f0rr0-github-io	Ready	Preview	Aug 31, 2026 9:58am