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feat(spaces): serve the core space XRPC surface #2584

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

Adds space-credential authentication, space writes and reads with MAC headers, simplespace reads, and the space OAuth scope ceiling, wired to the durable store at startup.

Co-Authored-By: Claude Code noreply@anthropic.com

Commits 0