Addresses review on PR-observation persistence:
- pr_checks now has an AFTER UPDATE CDC trigger (guarded on status change), so a
check flipping in_progress->failed on the same commit emits change_log instead
of updating silently. Restores symmetry with the sessions/pr triggers.
- writePR persists scalar facts + checks + comments in ONE transaction via
Store.WritePRObservation, so a mid-write failure can't leave the pr row (and
its CDC event) committed while checks/comments are partial. Collapses the
PRWriter port's three write methods into one WritePR.
- db.go: record why modernc.org/sqlite (pure-Go, CGO-free static binary) at the
import site.
Regression tests for both the update-trigger (emit on change, suppress no-op
re-poll) and the transactional write. go test -race ./... green.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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