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bbe729e5c7
A run of a box had core support and no HTTP surface. This adds both halves of it: a person asks for a run and reads it back, and the host agent the box is placed on is handed the work and reports what happened. The access rule is the point. An agent may only see or touch a run whose box is placed on its own hardware, and that is a `where` clause on every one of the three agent endpoints rather than a check next to them — host credentials are long-lived secrets sitting on hardware in somebody's home, so what one leaking can reach has to be decided by the query. "No such run" and "not your run" are the same refusal, so ids cannot be discovered by reporting states at them. `Session.setState` updated on the id alone, which means two agents polling the same work both succeed and both start the same box. There is one host today, which is exactly why that would have been built wrong and stayed wrong. The state a run is moving out of is now part of the `where` clause, so the database picks the winner; the loser gets a conflict rather than a silent no-op. Three cases that look alike are kept apart: re-reporting a state you already reported changes nothing and is not an error, a transition that does not exist is refused with the run left where it was, and another host reporting anything is forbidden. Asking for a run makes no decision about where it happens — a box already names its hardware, so the run inherits it by join. Placement therefore gets an interface at box creation, where the decision actually is, with the single-host case as its implementation and a deliberate refusal when there is more than one candidate and no policy to choose with. Tests cover the wire shape from both sides, the query scoping, the claim, and the timestamp idempotence a run's billing rests on.