feat: auto-update pouch and catalog sources during normal use

Add taste-skill to catalog.yaml, and refresh pouch plus cloned catalog
or custom Git sources on a 24h interval so users do not need a
separate update command.

tests/test_catalog_collections.py

@@ -204,6 +204,36 @@ class CatalogCollectionTests(unittest.TestCase):
         self.assertFalse((skill_dir / "first-skill").exists())
         self.assertFalse((skill_dir / "second-skill").exists())
 
+    def test_add_refreshes_collection_before_installing_new_children(self) -> None:
+        first = self.run_pouch("add", "test-pack/first-skill", "-g", "-a", "codex")
+        self.assertEqual(first.returncode, 0, first.stderr)
+
+        write_skill(self.upstream / "skills", "third-skill")
+        subprocess.run(["git", "-C", str(self.upstream), "add", "."], check=True)
+        subprocess.run(
+            [
+                "git",
+                "-C",
+                str(self.upstream),
+                "-c",
+                "user.name=Test",
+                "-c",
+                "user.email=test@example.com",
+                "commit",
+                "-m",
+                "add third",
+            ],
+            check=True,
+            capture_output=True,
+        )
+
+        second = self.run_pouch("add", "test-pack", "-g", "-a", "codex")
+        skill_dir = self.home / ".codex" / "skills"
+
+        self.assertEqual(second.returncode, 0, second.stderr)
+        self.assertTrue((skill_dir / "third-skill").is_symlink())
+        self.assertTrue((skill_dir / "third-skill" / "SKILL.md").is_file())
+
     def test_status_expands_collection_children(self) -> None:
         installed = self.run_pouch("add", "test-pack", "-g", "-a", "codex")
         status = self.run_pouch("status", "-a", "codex")