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a79cba0be7
Root cause: StatusSnapshot().CommittedLSN reports 0 in sync_all mode when the replica shipper has no flushed progress (NeedsRebuild state). This is correct for lineage-safe committed boundary, but PlanRebuild uses CommittedLSN as RebuildTargetLSN. With target=0, shouldStartSessionCommand rejects the StartRebuildCommand, and the rebuild IO never executes. Fix: PlanRebuild falls back to HeadLSN when CommittedLSN is 0. The primary's WAL head IS the data boundary the replica needs to reach. The fact that no replica has confirmed durability is exactly why we're rebuilding. Also adds command type logging to coreApplyAndLog so tester can verify which commands are actually emitted vs silently dropped. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>