fix: settle github activity worker queues

[f0rr0]

Summary

• decode ref-history fallback timestamps as runtime Date values
• count ordinary canonicalization as worker progress and prevent concurrent retries from moving settled watermarks
• preserve unchanged PR observation timestamps so audits do not invent reconciliation backlog
• validate PR membership completeness against expected count and terminal head at read, write, and audit boundaries
• invalidate stale PR-derived aliases before rejecting corrupt membership
• retry transient inconclusive projection reads within the bounded backfill deadline

Production evidence

• reproduced the deferred ref observation TypeError against its exact production row; correct decoding expands it to 135 SHAs / 34 tracked commits
• observed canonicalization draining eight rows per cron while reporting zero progress, explaining the apparent forever backfill
• identified 11 unchanged open PR versions whose observed_at was advanced without a provider change
• compared all current work PR memberships with GitHub: 184/186 were exact and the two defects are now covered by the integrity guard
• matched 28/28 sampled public sources across every rendered August day/repository and 12/12 sampled PRs against GitHub

Validation

• 242 tests pass
• 14 PostgreSQL integration tests pass
• typecheck, lint, formatting, and production build pass
• independent code review found no remaining blocker

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Project	Deployment	Actions	Updated (UTC)
f0rr0-github-io	Ready	Preview	Aug 31, 2026 8:32am