Shader library: fingerprint without node positions, a drag no longer recompiles (#65)

shaderFingerprint(graph) covers node id/type/params/ports and edge endpoints only;
x/y, collapsed, folded and edge ids stay out. ShaderLibrary keys on it and counts
compiles (__gm.shaderCompiles()). Measured before: one compile per preview step of a
node drag (12 for a harness drag); after: 0, a param change exactly +1.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

src/editor/debugHook.ts

@@ -415,6 +415,8 @@ export function installDebugHook(app: Application, state: EditorState, editor: E
     },
     /** Holds the shader clock at `at` seconds, so a Time shader's pixels can be measured; null releases it. */
     shaderTime: (at: number | null) => shaderLibrary.freezeTime(at),
+    /** Graphs compiled so far; a moved node must not add one (#65). */
+    shaderCompiles: () => shaderLibrary.compiles,
     /** Which views redraw every tick because a Time shader is on screen. */
     animates: () => ({ scene: viewport.animates, game: gameView.animates }),
     lowLatency: () =>