## Purpose

Collaborative rich text notes in Planner sessions, powered by CodeMirror 6 with Yjs CRDT sync and real-time cursor awareness.

## Requirements

### Requirement: Collaborative session notes
Planner sessions SHALL have a shared text editor for participants to write notes, with character-level real-time sync.

#### Scenario: Write notes
- **WHEN** a user types in the notes editor
- **THEN** the text syncs character-by-character to all other participants via Yjs Y.Text

#### Scenario: Remote cursor awareness
- **WHEN** multiple participants are editing notes
- **THEN** each participant sees the others' cursor positions and selections highlighted in their assigned color with their name label

#### Scenario: Notes persist across reload
- **WHEN** a participant reloads the session page
- **THEN** the notes content is restored from the Yjs document
- **AND** the editor displays the existing text immediately

#### Scenario: Notes persist across reconnect
- **WHEN** a user leaves and rejoins a session
- **THEN** the notes are still there (stored in Yjs doc and crash recovery)

### Requirement: Editor implementation
The notes editor SHALL use CodeMirror 6 with y-codemirror.next for Yjs binding.

#### Scenario: Undo/redo
- **WHEN** a user presses Ctrl+Z / Ctrl+Shift+Z in the notes editor
- **THEN** undo/redo applies to notes only (separate Y.UndoManager from waypoint undo)

#### Scenario: Awareness field isolation
- **WHEN** the notes editor sets cursor awareness state
- **THEN** it does not conflict with map cursor awareness (uses separate awareness fields)