feat(cockroach): add CockroachDB storage backend (KPEP-0001 phase 4)#4

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feat/cockroach-backend

Commits on Jul 1, 2026

feat(cockroach): scaffold backend package with pool config
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feat(cockroach): apply kv table schema and cluster settings
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feat(cockroach): storage.Interface Create, Get, Delete
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feat(cockroach): storage.Interface GetList with AS OF SYSTEM TIME
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feat(cockroach): storage.Interface GuaranteedUpdate
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feat(cockroach): changefeed subscription with resolved-timestamp progress
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feat(cockroach): Watch backed by the changefeed fanout
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feat(cockroach): 1-second TTL scanner + serializable-race handling
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feat(cockroach): register with backend registry + factory.Backend adapter
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feat(cockroach): storage.Interface conformance suite + young-DB AOST fallback
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fix(cockroach): initial-events for single-key watches + changefeed-ready gate
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feat(cockroach): implement Stats/ReadinessCheck/EnableResourceSizeEstimation + WatchList bookmark
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wip(cockroach): confirmed via e2e probes that watch path is correct
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Commits on Jul 2, 2026