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BFlatandClaude Opus 5.5
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* M9: real-time collaboration protocol (design) docs/collab-protocol.md: WebSocket sessions with a server-ordered, per-property last-writer-wins document sync, client-scoped ids, fractional positions for children, ephemeral presence (cursors, selections, follow), per-user undo, hosting from the app first and a self-hosted server next, and the implementation plan. ROADMAP gains M9. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> * M9: collaboration core: ids, change sets, server ordering, convergence Step 1 of docs/collab-protocol.md, no networking: - Client-scoped node ids: Document::set_client_id makes alloc_id hand out client << 32 | counter; single-user files allocate as before; the id counter is no longer part of document equality. - crates/collab (layer 2): the synced object/property model (every saved Node field, plus document-level styles, comments, variables, images, dev snapshots, library data), Change batches, an O(changed) diff, strict and lenient apply, fractional sibling positions, snapshots. - Server (ordering, validation, rejects with fixes) and Client (optimistic view, replay under remote batches, author-side repair of derived data) as pure state machines; binary (version byte + postcard, JSON values) and JSON message forms, fuzzed decoders. - Engine: normalize as the recompute hook, collab.diff. - Tests: round trips over random real commands, an N-client convergence fuzz test over delayed in-order links, junk batches. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> * M9: fmt after merge --------- Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>