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