feat(filter): multi-select states in the interactive builder

I made the builder's State prompt a completing-read-multiple, the way the Labels prompt already is, so you can pick several workflow states for one filter. The selection maps the way the spec describes: pick one and :state stays a scalar string, pick several and it becomes a list (state.name.in), pick none and there's no state constraint. The "[ Any. ]" sentinel is filtered out of the result like it is for labels.

Phase 2 of docs/multi-state-filter-spec.org. A stubbed-builder test covers the one/many/none mapping. Suite, compile, and lint green.

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