Shader assets: graph-built shaders, the Shader tab and sprite rows from the graph (#62)

A shader is an asset carrying a node graph (Texture color, Output, Property,
Color, Add/Subtract/Multiply/Divide, Mix, Luminance) that compiles to the GLSL
fragment of a Pixi filter. The Shader tab reuses the Behavior canvas; a sprite
wears a shader through its Shader picker, and the rows below it are the
graph's Property nodes. Property schema, resolution and deviation take the
project because a sprite's rows now live in another asset. The built-in
registry of the prototype is gone; "Adjust colors" ships as a graph in the
fixture and the three example games.

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

src/runtime/World.ts

@@ -128,7 +128,7 @@ export class World {
     entity.x = object.position.x;
     entity.y = object.position.y;
     entity.z = object.position.z;
-    const resolved = resolveSceneObjectProps(asset, object);
+    const resolved = resolveSceneObjectProps(this.project, asset, object);
     for (const key of Object.keys(entity.props)) if (!(key in resolved)) delete entity.props[key];
     Object.assign(entity.props, resolved);
     return entity;
@@ -187,7 +187,7 @@ export class World {
       if (!entity || !asset) continue;
       const p = object.position;
       const moved = p.x !== entity.x || p.y !== entity.y || p.z !== entity.z;
-      const base = resolveSceneObjectProps(asset, object);
+      const base = resolveSceneObjectProps(this.project, asset, object);
       const drifted = Object.keys(entity.props).filter((k) => k in base && base[k] !== entity.props[k]);
       if (!moved && drifted.length === 0) continue;
       // Only now, because a ref for resolved content costs a resolve of its own – and because a