fix: reconcile API annotations and debt baseline

app/api/endpoints/message.py

@@ -2,7 +2,7 @@ from __future__ import annotations
 
 import json
 import time
-from typing import Protocol, Union, Any, List, Optional
+from typing import Annotated, Any, List, Optional, Protocol, Union
 
 from fastapi import Depends, Request
 from starlette.responses import PlainTextResponse

tests/test_architecture_contract_baseline.py

@@ -126,8 +126,8 @@ def test_transaction_debt_baseline_is_a_model_and_oper_ratchet() -> None:
     baseline = json.loads(baseline_path.read_text(encoding="utf-8"))
 
     assert baseline["schema_version"] == 1
-    assert baseline["model_decorators"]["count"] == 75
-    assert sum(baseline["model_decorators"]["by_kind"].values()) == 75
+    assert baseline["model_decorators"]["count"] == 38
+    assert sum(baseline["model_decorators"]["by_kind"].values()) == 38
     assert baseline["model_decorators"]["by_kind"]["db_update"] == 0
     assert baseline["model_decorators"]["by_kind"]["async_db_update"] == 0
     assert baseline["model_transaction_calls"] == {"count": 0, "calls": []}