Add global research verification policy

dev/test_router_support.py

@@ -26,6 +26,7 @@ from router_support import (  # noqa: E402
 from ai_profile_router import (  # noqa: E402
     _cap_chat_generation,
     _context_matches,
+    _inject_global_system_policy,
     _normalize_chat_image,
     _normalize_chat_images,
     _normalize_llamacpp_reasoning,
@@ -201,6 +202,53 @@ class ChatGenerationLimitTests(unittest.TestCase):
                 )
 
 
+class GlobalSystemPolicyTests(unittest.TestCase):
+    def _inject(self, request: dict, path: str,
+                policy: str = "Verify facts.") -> dict:
+        with patch("ai_profile_router._load_global_system_policy",
+                   return_value=policy):
+            return _inject_global_system_policy(request, path)
+
+    def test_chat_policy_precedes_existing_system_prompt(self) -> None:
+        request = {"messages": [
+            {"role": "system", "content": "Client policy."},
+            {"role": "user", "content": "Hello"},
+        ]}
+        normalized = self._inject(request, "/v1/chat/completions")
+        self.assertEqual(
+            normalized["messages"][0]["content"],
+            "Verify facts.\n\nClient policy.",
+        )
+
+    def test_chat_policy_is_inserted_without_system_prompt(self) -> None:
+        request = {"messages": [{"role": "user", "content": "Hello"}]}
+        normalized = self._inject(request, "/v1/chat/completions")
+        self.assertEqual(normalized["messages"][0], {
+            "role": "system", "content": "Verify facts.",
+        })
+
+    def test_policy_is_not_duplicated(self) -> None:
+        request = {"messages": [{
+            "role": "system", "content": "Verify facts.\n\nClient policy.",
+        }]}
+        normalized = self._inject(request, "/v1/chat/completions")
+        self.assertEqual(
+            normalized["messages"][0]["content"].count("Verify facts."), 1)
+
+    def test_responses_policy_precedes_instructions(self) -> None:
+        request = {"instructions": "Client policy.", "input": "Hello"}
+        normalized = self._inject(request, "/v1/responses")
+        self.assertEqual(
+            normalized["instructions"],
+            "Verify facts.\n\nClient policy.",
+        )
+
+    def test_unrelated_endpoint_is_unchanged(self) -> None:
+        request = {"prompt": "Draw a cat"}
+        self.assertEqual(
+            self._inject(request, "/v1/images/generations"), request)
+
+
 class RetentionTests(unittest.TestCase):
     def test_oldest_pairs_are_removed(self) -> None:
         with tempfile.TemporaryDirectory() as temp: