hive-jobq-wire

Wire types for serving a hive-jobq graph to a viewer, plus the traits a host implements to say how its graph renders.

Why this is not part of hive-jobq. The scheduler crate is logic: a graph, a resource pool, a run loop. Presentation is a different concern with a different audience, and folding it in means every consumer of the scheduler also carries a JSON vocabulary it may never serve — the two get remixed and stay that way. A separate crate keeps that boundary where it can be seen.

A host implements WireNode for its node payload N and WireResource for its resource name R. GraphWire::wire_snapshot is then blanket-implemented for hive_jobq::Graph<N, R> — so the projection exists exactly when both types have said how they render, and a payload that hasn't cannot reach a viewer at all.