fix(agent): sanitize Codex tool-call history summaries

tests/agent/test_context_compressor.py

@@ -640,6 +640,30 @@ class TestCompressWithClient:
                 for tc in msg["tool_calls"]:
                     assert tc["id"] in answered_ids
 
+    def test_sanitizer_matches_responses_call_id_when_id_differs(self, compressor):
+        msgs = [
+            {
+                "role": "assistant",
+                "content": "",
+                "tool_calls": [
+                    {
+                        "id": "fc_123",
+                        "call_id": "call_123",
+                        "response_item_id": "fc_123",
+                        "type": "function",
+                        "function": {"name": "search_files", "arguments": "{}"},
+                    }
+                ],
+            },
+            {"role": "tool", "tool_call_id": "call_123", "content": "result"},
+        ]
+
+        sanitized = compressor._sanitize_tool_pairs(msgs)
+
+        assert [m.get("tool_call_id") for m in sanitized if m.get("role") == "tool"] == [
+            "call_123"
+        ]
+
     def test_summary_role_avoids_consecutive_user_messages(self):
         """Summary role should alternate with the last head message to avoid consecutive same-role messages."""
         mock_client = MagicMock()