Author tagging

Who wrote which stems.

Sidecar model (v1)

Stored in project as coDjMeta (parallel to channels):

{
  "coDjMeta": {
    "tracks": {
      "c0": { "ownerActorId": "agent-1", "authorId": "agent-a", "masterLock": false, "lastTouchedPerfStep": 0 },
      "c3": { "ownerActorId": "human-xyz", "authorId": "u1", "masterLock": true, "lastTouchedPerfStep": 240 }
    }
  }
}

ensureCoDjMeta in src/codj/CoDjMeta.tish only ever builds the tracks object, keyed by channelId. A lanes object is _not_ created (Planned).

• ownerActorId: which lane’s deck is authoritative for this channel’s body (after merge).
• masterLock: if true, only master/human actor may change this track until released. Now has a UI toggle: a per-track LOCK/OPEN button in the channel rack (src/ui/ChannelRack.tish) calls setMasterLock.
• authorId: last writer or creator.
• lastTouchedPerfStep: performance step at which the track was last written (setTrackTouched).

Merge precedence

1. If masterLock and actor is not master → ignore non-master deck for that channelId from other actors (or require control overwrite).
2. Else use ownerActorId’s latest deck for that track id.
3. New track from actor X → ownerActorId = X, authorId = emitter.

Planned: inline deck

Optional parser extension (still unimplemented):

track Kick id c0 gen noise_burst @lane ai-a

The inline @lane ai-a tag form is not yet parsed; the sidecar (coDjMeta.tracks) remains the source of truth.

UI

• Channel rack badge: color by ownerActorId.
• Mixer strip: tint if overlay active.