Akiba So 953c7b700f feat(storage): sidecar model + atomic store (lib only) ...

Phase 1 of the file-based storage plan. Pure library, no runtime
behavior change yet (editors still use SQLite).

- BadnoteSidecar: per-file annotation document (schema-versioned)
  holding per-page ink (EditorStroke JSON), text highlights,
  scratch-link anchors (ScratchLink JSON) each with its own
  scratchpad (InkStroke world-coord JSON), and bookmarks. Reuses the
  existing toJson formats — no parallel stroke format.
- SidecarStore.writeAtomic: temp-file + rename atomic write keeping a
  .bak; read() falls back to .bak on a missing/corrupt primary.

Round-trip + atomic-write + .bak-recovery tests. analyze clean,
322 tests green.

2026-06-24 20:53:01 +08:00

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