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feat(spaces): add the protocol primitives crate #2578

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

Space refs, LtHash, DHKEM(P-256), commit and record MACs, space tokens, HTTP message signatures and STAR-lite archives, with unit tests. The plan is updated from blocked to open against the alpha branch.

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

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