Agent harness

A model is a probability, not code: the same conversation can go another way on the next run, and a rule it must remember to follow, it will sometimes forget. The harness is everything around the model that makes the critical path near-certain anyway: code that checks the facts that matter, context that arrives only when it applies, tools that refuse the wrong state, and a history the agent can trust. 100% is not reachable with a model; near 100% on the path that costs money or trust is, by backing each rule there with code.

Apply only the routes and checks for the selected job. Read a linked skill's named file from its installed folder when available, or from the linked source. Report an unavailable required reference instead of inventing it. [skill-authoring, DISTRIBUTION.md#composing-skills]