Full notes lifecycle:
- GPX: description field in GpxData, <metadata><desc> in generate/parse
- Export: Plan GPX and Save to Journal include notes as description
- Journal: updateRoute extracts description from GPX, stores on route
- Reimport: Edit in Planner passes notes via URL params → Yjs Y.Text
- Drop import: GPX with <desc> restores notes in session
Spec updated: session-notes gains GPX export, Journal sync, and
reimport requirements.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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