od-tune-collab (scenario)

Spec §1 / §10.1 / §21.5 / §23.3.3: the canonical "iterate on an existing artifact" flow. Inherits parentArtifactId from the project metadata so the produced artifact's ArtifactManifest.parentArtifactId is set automatically — the artifact lineage chain stays intact across multi-turn tune cycles.

Default pipeline

{
  "stages": [
    { "id": "direction", "atoms": ["direction-picker"] },
    { "id": "patch",     "atoms": ["patch-edit"] },
    {
      "id": "critique",
      "atoms": ["critique-theater"],
      "repeat": true,
      "until": "critique.score>=4 || iterations>=3"
    },
    { "id": "handoff",   "atoms": ["handoff"] }
  ]
}

The handoff stage records handoffKind: 'patch' (or 'deployable-app' when the user opted in via od plugin run --target deployable-app AND build-test ran successfully somewhere upstream in the project's history).