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feat(spaces): sync blobs with access control and GC safety #2602

targeting main from blobs
Closed opened by and assigned to borel-balisong.test.pds.did.bot
targeting main from blobs

Syncs blobs with access control and GC safety: getBlob and listBlobs derive references from records, an unreferenced blob answers BlobNotFound, and the collector is held off across the held-blob check and the append.

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