feat(mma): Implement logging/auditing for role hand-offs

tests/test_mma_exec.py

@@ -96,3 +96,22 @@ def test_get_dependencies(tmp_path):
     filepath.write_text(content)
     dependencies = get_dependencies(filepath)
     assert dependencies == ['os', 'sys', 'file_cache', 'mcp_client']
+
+
+import re
+def test_execute_agent_logging(tmp_path):
+    log_file = tmp_path / "mma_delegation.log"
+    with patch("scripts.mma_exec.LOG_FILE", str(log_file)), \
+         patch("subprocess.run") as mock_run:
+        mock_process = MagicMock()
+        mock_process.stdout = ""
+        mock_process.returncode = 0
+        mock_run.return_value = mock_process
+        test_role = "tier1"
+        test_prompt = "Plan the next phase"
+        execute_agent(test_role, test_prompt, [])
+        assert log_file.exists()
+        log_content = log_file.read_text()
+        assert test_role in log_content
+        assert test_prompt in log_content
+        assert re.search(r"\d{4}-\d{2}-\d{2}", log_content)