feat(auth): add opaque bearer sessions

server/tests/test_agent_foundation_endpoints.py

@@ -2,6 +2,7 @@ from __future__ import annotations
 
 from collections.abc import Generator
 
+from auth_helpers import install_legacy_header_auth_override
 from fastapi.testclient import TestClient
 from sqlalchemy import create_engine
 from sqlalchemy.orm import Session, sessionmaker
@@ -23,7 +24,8 @@ def build_client() -> tuple[TestClient, sessionmaker[Session]]:
     Base.metadata.create_all(bind=engine)
     session_factory = sessionmaker(bind=engine, autoflush=False, autocommit=False)
 
-    app = create_app()
+    app = create_app()
+    install_legacy_header_auth_override(app)
 
     def override_db() -> Generator[Session, None, None]:
         db = session_factory()