fix: remove lingering LGraph.start() call

Missed in initial deletion - also clean README example.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/lib/litegraph/README.md

@@ -104,8 +104,6 @@ const secondNode = LiteGraph.createNode('basic/sum')
 graph.add(secondNode)
 
 firstNode.connect(0, secondNode, 1)
-
-graph.start()
 ```
 
 ## Projects using it

src/scripts/app.ts

@@ -947,8 +947,6 @@ export class ComfyApp {
       }
     )
 
-    this.rootGraph.start()
-
     // Ensure the canvas fills the window
     useResizeObserver(this.canvasElRef, ([canvasEl]) => {
       if (canvasEl.target instanceof HTMLCanvasElement) {