Take the cross-cutting queries out of the model's base module

findPropertyUsages walks override sites, so Project.ts imported instance.ts
while instance.ts imported Project.ts – the repo's only value-level import
cycle. The queries now sit in usages.ts and Project.ts is a base type module
again. requireScene has had no caller since holderId replaced sceneId.

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

tests/core/holders.test.ts

@@ -9,14 +9,9 @@ import { CreateContainerCommand } from '../../src/core/commands/containerCommand
 import { SetOverrideCommand } from '../../src/core/commands/sceneObjectCommands';
 import { RemoveVariableCommand, RenameVariableCommand } from '../../src/core/commands/variableCommands';
 import type { ContainerAsset } from '../../src/core/model/Asset';
-import {
-  findAsset,
-  findObjectHolder,
-  findUsages,
-  listContainers,
-  objectHolders,
-} from '../../src/core/model/Project';
+import { findAsset, findObjectHolder, listContainers, objectHolders } from '../../src/core/model/Project';
 import { instanceChildId } from '../../src/core/model/instance';
+import { findUsages } from '../../src/core/model/usages';
 import { makeBehavior, makeSpriteScene, place } from '../helpers';
 
 /** A behavior with a `speed` variable, placed and overridden to 42, then wrapped in a container. */

tests/core/texture.test.ts

@@ -1,7 +1,8 @@
 import { describe, expect, it } from 'vitest';
 import { CreateTextureCommand } from '../../src/core/commands/assetCommands';
 import type { TextureAsset } from '../../src/core/model/Asset';
-import { findAsset, findPropertyUsages, findUsages } from '../../src/core/model/Project';
+import { findAsset } from '../../src/core/model/Project';
+import { findPropertyUsages, findUsages } from '../../src/core/model/usages';
 import {
   DEFAULT_SLICE,
   isTextureFile,