Cosmos3 TAO training

Keep one shared model-facing frontend. Backend image fields and contract paths live under backend_contracts in references/skill_info.yaml; image literals are stamped from versions.yaml, while referenced backend YAMLs define native runtime schemas. Never translate between them.

Mandatory runtime intake

Before planning training, collect all of the following. Do not infer a path from history, another user, a prior job, an image, or a developer checkout.