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feat(spaces): add the durable space store #2583

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

A separate append-only log for space authorities, members, permissioned repos, oplog, revocations and notification registrations, with batch replay that discards torn writes and recomputes the set hash on restore.

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

Commits 8

feat(spaces): add the durable space store
test(spaces): cross-check the protocol crate against the TypeScript reference
feat(spaces): give every account a P-256 KEM key
test(agentd): use a genuinely unread scope in the audit test
feat(spaces): add the space OAuth scope grammar
feat(spaces): vendor the space and simplespace lexicons
fix(spaces): apply the protocol crate's security review
feat(spaces): add the protocol primitives crate