buscalls.ChunkBytes (512 KiB), mesh/objects.put-chunk and get-chunk with the store named in each chunk, the digest and size
of a get checked, the capability word put-sessions required, and a bundle's refusal of a value over 8 MiB gone.
Builds: design 47 G §518, §345, §490, §620, A-21
Claude-Session: https://claude.ai/code/session_01JG73KEq4zoDfM9WtYpcQgZ