Create a sprite asset from a texture's context menu

The sprite takes the whole image at its pixel size and the texture's name,
numbered like any other clash. CreateAssetCommand now accepts starting
properties; they go through the schema in execute, so an unknown key or a
bad value is refused before the project is touched, and one undo removes
the asset.

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

tools/e2e/12-textures.mjs

@@ -326,4 +326,47 @@ export async function textures(t) {
     'undo takes the adopted asset back out',
     (await json("__gm.state.project.assets.filter((a) => a.type === 'texture').length")) === 1,
   );
+
+  // 19f. Right-clicking a texture asset makes a sprite wearing it at the picture's pixel size.
+  const entryText = 'Create sprite from texture';
+  const spriteRow = await json("__gm.assetRow('crate')");
+  await click(spriteRow.x, spriteRow.y, 'right');
+  await sleep(200);
+  check(
+    'a sprite asset does not offer making a sprite from it',
+    (await json(`__gm.locate(${JSON.stringify(entryText)}, false)`)) === null,
+  );
+  await press('Escape');
+  await sleep(150);
+
+  const spritesBefore = await json("__gm.state.project.assets.filter((a) => a.type === 'sprite').length");
+  const textureRow = await json(`__gm.assetRow(${JSON.stringify(texture.id)})`);
+  await click(textureRow.x, textureRow.y, 'right');
+  await sleep(200);
+  const createEntry = await json(`__gm.locate(${JSON.stringify(entryText)}, false)`);
+  check('a texture asset offers making a sprite from it', createEntry !== null);
+  if (createEntry) {
+    await click(createEntry.x, createEntry.y);
+    await sleep(400);
+    const made = await json(`(() => {
+      const s = __gm.state.selection;
+      const a = s && s.kind === 'asset' ? __gm.state.project.assets.find((x) => x.id === s.assetId) : null;
+      return a ? { type: a.type, name: a.name, props: a.props } : null;
+    })()`);
+    check(
+      'the new sprite is selected and wears the texture at its pixel size',
+      made?.type === 'sprite' &&
+        made.props.texture === texture.id &&
+        made.props.width === 64 &&
+        made.props.height === 48,
+      JSON.stringify(made),
+    );
+    check('it is named after the texture', made?.name === `${texture.name} 2`, JSON.stringify(made?.name));
+    await shot('35b-sprite-from-texture');
+    await undo();
+    check(
+      'undo takes the new sprite back out',
+      (await json("__gm.state.project.assets.filter((a) => a.type === 'sprite').length")) === spritesBefore,
+    );
+  }
 }