feat(skills_sync): surface collision with reset-hint

When a newly-bundled skill's name collides with a pre-existing user
skill, sync silently kept the user's copy. Users never learned that
a bundled version shipped by that name.

Now (on non-quiet sync only) print:

  ⚠ <name>: bundled version shipped but you already have a local
    skill by this name — yours was kept. Run `hermes skills reset
    <name>` to replace it with the bundled version.

No behavior change to manifest writes or to the kept user copy —
purely additive warning on the existing collision-skip path.

tests/tools/test_skills_sync.py

@@ -460,6 +460,28 @@ class TestSyncSkills:
             "as 'user-modified' — the manifest was poisoned on the first sync."
         )
 
+    def test_collision_prints_reset_hint(self, tmp_path, capsys):
+        """Non-quiet sync must print a reset hint when a collision is skipped.
+
+        Silent skip hides the fact that a bundled skill shipped but was
+        shadowed by the user's local copy. The hint tells the user the
+        exact command to take the bundled version instead.
+        """
+        bundled = self._setup_bundled(tmp_path)
+        skills_dir = tmp_path / "user_skills"
+        manifest_file = skills_dir / ".bundled_manifest"
+
+        user_skill = skills_dir / "category" / "new-skill"
+        user_skill.mkdir(parents=True)
+        (user_skill / "SKILL.md").write_text("# From hub — unrelated to bundled")
+
+        with self._patches(bundled, skills_dir, manifest_file):
+            sync_skills(quiet=False)
+
+        captured = capsys.readouterr().out
+        assert "new-skill" in captured
+        assert "hermes skills reset new-skill" in captured
+
     def test_nonexistent_bundled_dir(self, tmp_path):
         with patch("tools.skills_sync._get_bundled_dir", return_value=tmp_path / "nope"):
             result = sync_skills(quiet=True)

tools/skills_sync.py

@@ -218,6 +218,13 @@ def sync_skills(quiet: bool = False) -> dict:
                     skipped += 1
                     if _dir_hash(dest) == bundled_hash:
                         manifest[skill_name] = bundled_hash
+                    elif not quiet:
+                        print(
+                            f"  ⚠ {skill_name}: bundled version shipped but you "
+                            f"already have a local skill by this name — yours "
+                            f"was kept. Run `hermes skills reset {skill_name}` "
+                            f"to replace it with the bundled version."
+                        )
                 else:
                     dest.parent.mkdir(parents=True, exist_ok=True)
                     shutil.copytree(skill_src, dest)