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# Storage layer
The storage adapter owns `active.log`, `snapshot.bin`, the data-directory lock,
in-memory live/deleted state, synchronous PUT/DEL writes, startup replay, and
compaction. It depends only on the UTF-8, opaque-handle API in `src/sys`; OS
file and durability primitives do not leak into this layer.
The binary format is private but versioned. Invalid complete records are never
skipped; only an incomplete EOF record is truncated. Snapshot generation must
match the active log before snapshot state is trusted.
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