* fix(gsd): reconcile stale slice rows and rebuild STATE.md before DB close
Two coupled defects caused auto-mode split-brain where dispatch falsely
reported "No slice eligible" while STATE.md showed executable work:
1. deriveStateFromDb() reconciled missing slice rows but not stale
existing ones. A slice with status "pending" in the DB but a SUMMARY
file on disk was never repaired, permanently blocking downstream
slices. Added slice-level stale reconciliation matching the existing
task-level pattern.
2. stopAuto() closed the DB before rebuilding STATE.md, forcing
deriveState() into filesystem fallback mode. Moved rebuildState()
before closeDatabase() so stop-time STATE.md uses the same
authoritative DB backend as dispatch.
Fixes#3599
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
* test: add regression test for stale slice row reconciliation
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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