A state change is something the graph can react to, so the machine announces it (#53, #54, #55, #57)

Four issues that all reach for the same line: how the current state is
read and written. Splitting them into four commits would mean four
states of the tree that do not compile, so they arrive together.

#55 start state — the machine asset carries an optional `start` holding
a State node's id. Right-click a state to set or remove it, a ring in
the node's title says which one it is. A dead id (the state was deleted)
reads as "no start", so nothing has to clean up after a deletion.

#53 entered/exited — `On state entered` and `On state exited`, one exec
output per state. Every change now goes through a single `setState`
that reports it; BehaviorSystem delivers it after the exec flow that
caused it, `exited` of the old before `entered` of the new, round after
round until the queue is empty, with a cap that stops a ping-pong graph
with an endless-loop error. A local machine tells the instance that
switched, a global one tells every instance holding a matching event
node. The start state fires `entered` too: per instance for a local
machine, once per run for a global one.

#57 reading — `Current state` with `name` for showing and `id` for
comparing, `Is in state` with one boolean per state. Neither has a
`run`, so `read` learned `def` and `lookup`, and the catalog test knows
this third kind of node.

#54 seeing it — during a run the state machine tab marks every state
some instance is holding faintly, and the one held by the selected
scene object's instance strongly.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

src/editor/EditorRun.ts

@@ -5,6 +5,7 @@ import { hasEditorRun, runsInEditor } from '../core/properties/editorRun';
 import { addGameSystems, type BehaviorSystem, behaviorError } from '../runtime/systems/BehaviorSystem';
 import { Input } from '../runtime/systems/Input';
 import { type ModelWrite, World } from '../runtime/World';
+import type { LiveMachineState } from './graph/GraphCanvas';
 import type { EditorState } from './state';
 
 export interface EditorRunHooks {
@@ -69,6 +70,11 @@ export class EditorRun {
     if (!write.values && !write.structure && this.showsVariables()) this.state.runtimeTick();
   }
 
+  /** Which state each instance of a machine holds in this run; empty when no editor run is on. */
+  machineStates(machineId: string): LiveMachineState[] {
+    return this.behaviors?.machineStates(machineId) ?? [];
+  }
+
   /** The values a Variables asset shares in this run; null when no editor run is on. */
   liveVariables(assetId: string): PropertyBag | null {
     return this.behaviors?.liveVariables(assetId) ?? null;