feat(snapshot-skip B3): cold-start restoreSnapshotState skip gate + CRC verifier + metrics#934

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impl/snapshot-skip-b3-skip-gate

Commits on Jun 5, 2026

feat(raftengine): SnapshotHeaderApplier opt-in interface (B3 step 1)
bootjp
committed
feat(kv/fsm): kvFSM implements SnapshotHeaderApplier (B3 step 2)
bootjp
committed
feat(raftengine/etcd): cold-start snapshot-restore skip gate (B3 steps 3+4)
bootjp
committed
feat(raftengine,monitoring): cold-start skip-gate metrics + INFO log (B3 step 5)
bootjp
committed
test(raftengine/etcd): cold-start skip gate + CRC failure modes (B3 step 6)
bootjp
committed
fix(raftengine/etcd): plumb ColdStartObserver through factory
bootjp
committed