e5ed67a282
Dual plug only responds to per-channel state_1/state_2 commands, not the
shared {state:TOGGLE} payload. Route single-filter through a couch-mapper
that emits {"state_1":"TOGGLE","state_2":"TOGGLE"} so both outlets flip.
Also adds state-in node, /set out node, and dashboard widget showing
state_1/state_2. Verified E2E + 567 Rego checks pass.
Refs: david/nr-flow-validator#2