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

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bootjp merged 13 commits into

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Jun 7, 2026

feat(raftengine): SnapshotHeaderApplier opt-in interface (B3 step 1)
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feat(kv/fsm): kvFSM implements SnapshotHeaderApplier (B3 step 2)
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feat(raftengine/etcd): cold-start snapshot-restore skip gate (B3 steps 3+4)
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feat(raftengine,monitoring): cold-start skip-gate metrics + INFO log (B3 step 5)
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test(raftengine/etcd): cold-start skip gate + CRC failure modes (B3 step 6)
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fix(raftengine/etcd): plumb ColdStartObserver through factory
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raftengine/etcd: gate cold-start skip on lastWalIndex, not snap.Index (codex P1 #934)
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raftengine/etcd: complete cold-start skip-gate (codex P1+P2 + coderabbit Major #934)
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raftengine/etcd + monitoring: gate on Commit + absolute executed gauge (codex P2 #934 round 3)
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raftengine/etcd: align test double + log fields with metric semantics (claude #934 round 5)
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raftengine: preserve volatile HLC lease entries past skip gate (codex P1 #934 round 7)
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raftengine: skip stale SetApplyIndex on volatile replay + cover encrypted-volatile path (claude #934 round 7 F1+F2)
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raftengine: document header-error-before-CRC ordering in applyHeaderStateOnSkip (claude #934 R1-F1)
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