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/editor/list/slot.ts

@@ -12,7 +12,12 @@ import { isList, type ListValue, type PropertyValue, type StructValue } from '..
 import { findAsset } from '../../core/model/Project';
 import { FIELD_KINDS, LIST_ITEM_KINDS, type ListItemKind } from '../../core/properties/kinds';
 import { fieldLike, type ListItem, itemLike, structItemOf } from '../../core/properties/listItems';
-import { type PropertyDef, schemaForAsset, structOf } from '../../core/properties/PropertySchema';
+import {
+  type PropertyDef,
+  schemaForAsset,
+  schemaForObject,
+  structOf,
+} from '../../core/properties/PropertySchema';
 import { resolveAssetProps } from '../../core/properties/resolve';
 import type { FieldHandlers } from '../inspector/fieldFactory';
 import { currentProps, currentRef } from '../inspector/objectQueries';
@@ -149,14 +154,14 @@ function access<Target>(
 
 function assetOwner(state: EditorState, slot: Extract<ListSlot, { kind: 'asset' }>): Owner<Asset> | null {
   const asset = findAsset(state.project, slot.assetId);
-  const def = asset && schemaForAsset(asset).find((d) => d.key === slot.key);
+  const def = asset && schemaForAsset(state.project, asset).find((d) => d.key === slot.key);
   if (!asset || !def) return null;
   return {
     def,
     title: `${asset.name} · ${def.label}`,
     current: () => {
       const now = findAsset(state.project, slot.assetId);
-      return now && resolveAssetProps(now)[slot.key];
+      return now && resolveAssetProps(state.project, now)[slot.key];
     },
     spec: assetValue(state, slot.assetId, slot.key),
   };
@@ -168,7 +173,7 @@ function objectOwner(
 ): Owner<ObjectRef> | null {
   const ref = currentRef(state, slot.holderId, slot.objectId);
   const owner = ref && findAsset(state.project, ref.object.assetId);
-  const def = owner && schemaForAsset(owner).find((d) => d.key === slot.key);
+  const def = owner && schemaForObject(state.project, owner, ref.object).find((d) => d.key === slot.key);
   if (!ref || !def) return null;
   return {
     def,