🐛 fix(playbook): add heading to generated CLAUDE.md

tests/cli/test_playbook_cli.py

@@ -607,6 +607,7 @@ project_name = "Demo"
             claude_md = Path(tmp_dir) / "CLAUDE.md"
             self.assertTrue(claude_md.exists())
             text = claude_md.read_text(encoding="utf-8")
+            self.assertTrue(text.startswith("# CLAUDE.md\n\n"))
             self.assertIn("@AGENTS.md", text)
             self.assertIn("<!-- playbook:claude:start -->", text)
 
@@ -665,6 +666,39 @@ project_name = "Demo"
             self.assertIn("@AGENT_RULES.md", text)
             self.assertEqual(text.count("<!-- playbook:claude:start -->"), 1)
 
+    def test_sync_claude_md_adds_heading_to_generated_block(self):
+        with tempfile.TemporaryDirectory() as tmp_dir:
+            claude_md = Path(tmp_dir) / "CLAUDE.md"
+            claude_md.write_text(
+                "<!-- playbook:claude:start -->\n"
+                "\n"
+                "@AGENTS.md\n"
+                "@AGENT_RULES.md\n"
+                "\n"
+                "<!-- playbook:claude:end -->\n",
+                encoding="utf-8",
+            )
+
+            config_body = f"""
+[playbook]
+project_root = "{tmp_dir}"
+deploy_root = "{CUSTOM_DEPLOY_ROOT}"
+
+[sync_memory_bank]
+project_name = "Demo"
+"""
+            config_path = Path(tmp_dir) / "playbook.toml"
+            config_path.write_text(config_body, encoding="utf-8")
+
+            result = run_cli("-config", str(config_path))
+
+            self.assertEqual(result.returncode, 0)
+            text = claude_md.read_text(encoding="utf-8")
+            self.assertTrue(text.startswith("# CLAUDE.md\n\n"))
+            self.assertIn("@AGENTS.md", text)
+            self.assertIn("@AGENT_RULES.md", text)
+            self.assertEqual(text.count("<!-- playbook:claude:start -->"), 1)
+
     def test_sync_claude_md_skips_when_already_references_agents(self):
         with tempfile.TemporaryDirectory() as tmp_dir:
             claude_md = Path(tmp_dir) / "CLAUDE.md"