The Tauri app currently loads .ipynb files, parses them into NotebookState, and populates the daemon's Automerge room via mutations. This is backwards — saving is already daemon-delegated, loading should be too.

Status

Completed ✅ (merged to main)

• Phases 1-3: Protocol extension (OpenNotebook/CreateNotebook handshake + NotebookConnectionInfo response), daemon-side loading (load_notebook_from_disk, create_empty_notebook), connection handlers with race condition fix and trust check — PR feat(runtimed): daemon-owned notebook loading infrastructure (#598) #601
• Phase 5: NotebookSyncClient methods (connect_open_split, connect_create_split, do_initial_sync) — PR feat(runtimed): daemon-owned notebook loading infrastructure (#598) #601

In review: Phase 4 + 6 + 7 — PR #602

• Phase 4: All notebook creation/opening entry points converted to daemon requests
• Phase 6: Session save reads from Arc fields instead of NotebookState
• Phase 7: notebook_state field removed from WindowNotebookContext, FrontendCell removed from lib.rs, dead code deleted (-513 lines)
• Bug fixes: placeholder_id for Restore variant, persisted Automerge doc preservation for untitled notebooks

Remaining (minor follow-up)

• notebook_state.rs module file still declared — can be deleted once no external crate references it

Target flow

Tauri sends OpenNotebook { path } to daemon
  → daemon loads .ipynb, derives notebook_id, creates room, populates doc
  → daemon returns NotebookConnectionInfo { notebook_id, cell_count, needs_trust_approval }
  → Automerge sync → relay forwards bytes → frontend WASM
  → frontend shows loading state until cells arrive (#599)

What gets eliminated

• NotebookState struct usage from lib.rs and session.rs
• initialize_notebook_sync's cell/metadata population through the relay
• load_notebook_state_for_path, create_new_notebook_state factory functions
• All new_empty_with_* constructor usage
• derive_notebook_id in Tauri (daemon owns this now)
• FrontendCell usage in lib.rs
• get_cells() call in save_notebook_as (daemon has the cells)

Dependencies

• Unblocks feat: notebook loading state for daemon-owned doc population #599 (loading state UX) and refactor: reduce NotebookSyncClient to pure relay — drop AutoCommit #600 (pure relay — drop AutoCommit)
• Known limitations tracked in fix: canonical document resolution on room creation (saved edits + trust) #604 (canonical document resolution)