feat: support D1-backed crowd reports

[duncanleo]

Summary

• Move crowd-report GitHub dispatch out of the database transaction by claiming candidate report rows first, committing that claim, then marking success or failure after the external repository_dispatch call.
• Add a D1-compatible short-lived dispatch marker so concurrent dispatch attempts skip in-progress report rows while allowing stale claims to be retried.
• Replace the public-holiday sync's raw excluded.* conflict update fragments with per-row bound update values.
• Record the Phase 5 progress in the D1 migration plan.

Validation

• npm run verify

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