refactor: replace oplog with public Op/ReadOp sum types on Backend interface#236
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…terface Move the metadatadb abstraction from blob-level Load/Store to operation-level Apply/Query, enabling future backends (e.g. Redis) to handle ops natively rather than serializing entire namespaces. - Introduce Op and ReadOp sealed interfaces with exhaustive type switches in applyOp/queryState - Replace old Backend (Load/Store/Lock/Unlock) with new Backend (Apply/Query/Flush/Close) - Inline sync machinery directly into S3Backend - MemoryBackend implements Backend directly with no sync - Add TwoBackendsConcurrentOps test exercising cross-backend sync Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Move the metadatadb abstraction from blob-level Load/Store to
operation-level Apply/Query, enabling future backends (e.g. Redis)
to handle ops natively rather than serializing entire namespaces.
switches in applyOp/queryState
(Apply/Query/Flush/Close)
Co-Authored-By: Claude Opus 4.6 (1M context) noreply@anthropic.com