feat(metadb): add transactional blob ref tracking and expiry reaper#13
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- Add PutMetaWithRefs/DeleteMetaWithRefs for atomic ref counting - Add UpdateJSON for atomic read-modify-write operations - Add ExpiryReaper for background cleanup of expired metadata - Migrate npm protocol to use metadb instead of filesystem backend Blob refs are now tracked per meta-key with diff computation on overwrites, preventing ref drift and enabling safe TTL-based expiration with automatic ref decrement.
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Blob refs are now tracked per meta-key with diff computation on overwrites,
preventing ref drift and enabling safe TTL-based expiration with automatic
ref decrement.