sync: update from private repo (d3780b00)

src/engine/tools/skills.test.ts

@@ -190,7 +190,8 @@ describe('ReadSkill tool', () => {
     expect(fs.existsSync(path.join(workspace, 'skills', 'tdd'))).toBe(false);
   });
 
-  it('keeps the previous copy intact when refreshing fails mid-copy', () => {
+  // root ignores chmod-based read denial, so this failure injection only holds as non-root.
+  it.skipIf(process.getuid?.() === 0)('keeps the previous copy intact when refreshing fails mid-copy', () => {
     const systemDir = makeTempDir();
     const userRoot = makeTempDir();
     const workspace = makeTempDir();