The loader keeps no migrations any more: an asset of the old type autotile (before #131) is an unknown type and dropped, and a tilemap layer with the cell map of the first version (before #134) loads empty; every project is saved in the current format, and the two tests now pin that the old shapes are not read (#137)

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

tests/core/tile.test.ts

@@ -417,29 +417,17 @@ describe('tile in the document', () => {
     expect(tilePlayback(read)).toBe('loop');
   });
 
-  /**
-   * #131 renamed the asset and made a plain tile the default. A project saved before that holds
-   * `autotile` assets, and one of them without a stored kind meant a floor block: it has to open as
-   * the same floor, not turn into a plain tile.
-   */
-  it('reads an autotile of an older project as the tile it was', () => {
+  // No migration any more (#137): `autotile`, the name before #131, is an unknown type like any other.
+  it('drops an asset of the old type autotile', () => {
     const raw = {
       id: 'p',
       assets: [
         { id: 's', type: 'scene', name: 'Main', props: {}, objects: [] },
-        { id: 'a', type: 'autotile', name: 'Old grass', props: {}, pictures: ['x'] },
-        { id: 'b', type: 'autotile', name: 'Old wall', props: { kind: 'wall', fps: 2 }, pictures: [] },
+        { id: 'a', type: 'autotile', name: 'Old grass', props: { kind: 'floor' }, pictures: ['x'] },
         { id: 'c', type: 'tile', name: 'New', props: {}, pictures: [] },
       ],
     };
-    const project = deserializeProject(raw);
-    const byId = (id: string) => project.assets.find((a): a is TileAsset => a.id === id && a.type === 'tile');
-    expect(byId('a')?.pictures).toEqual(['x']);
-    expect(tileKind(byId('a')!)).toBe('floor');
-    expect(tileKind(byId('b')!)).toBe('wall');
-    expect(byId('b')?.props.fps).toBe(2);
-    expect(tileKind(byId('c')!)).toBe('none');
-    expect(project.assets.some((a) => (a.type as string) === 'autotile')).toBe(false);
+    expect(deserializeProject(raw).assets.map((a) => a.id)).toEqual(['s', 'c']);
   });
 });