refactor(state-machine): support multiple lifecycles per blueprint

Blueprint.stateMachine becomes stateMachines[], the viewer renders each
machine in its own panel, and StateMachine draws self-loops (a === b) for
recurring transitions that don't change state. Existing blueprints move
to the array form unchanged.

src/data/gridBlueprint.ts

@@ -202,5 +202,5 @@ export const grid: Blueprint = {
     ],
   },
 
-  stateMachine: LOADSTATE_MACHINE,
+  stateMachines: [LOADSTATE_MACHINE],
 }