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feat(enum)!: add sentinel errors and cache helpers, privatize the enumcache mutex, and streamline enumdb loading

enumbitmap: export ErrUnknownBitValues and ErrUnknownStringValues and wrap them with %w so callers can match partial-conversion results with errors.Is; document the single-bit power-of-two contract, the unreachable id 0, and the 64-bit/int portability caveat; simplify the decode loop; add benchmarks and round-trip/sentinel tests.

enumcache: demote the embedded sync.RWMutex to a private field so Lock/Unlock/RLock/RUnlock are no longer part of the public API; export ErrNameNotFound and ErrIDNotFound; add Len, Has, HasID, and Delete; document the DecodeBinaryMap/EncodeBinaryMap bit-value contract; add benchmarks and tests for the sentinels, the cross-rekey path, and the new helpers.

enumdb: execute the one-shot, parameterless load query directly with db.QueryContext instead of preparing a statement, removing a round trip and the stmt.Close bookkeeping; prefix wrapped errors with "enumdb:" and document the all-or-nothing fail-fast behavior of New.

BREAKING CHANGE: enumcache.EnumCache no longer promotes the sync.RWMutex methods (Lock/Unlock/RLock/RUnlock); locking is now internal.

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