fix: update test assertions for graceful oversized message recovery

- Update test_run_agent_stdio_buffer_limit to expect a warning log
  instead of a crash, matching the new recovery behavior
- Apply ruff format to test_connection_recovery.py (line wrapping)

Author: koriyoshi2041

tests/real_user/test_stdio_limits.py

@@ -69,10 +69,11 @@ async def list_capabilities(self):
             [sys.executable, small_agent], input=large_msg, capture_output=True, text=True, timeout=2
         )
 
-        # Should have errors in stderr about the buffer limit
-        assert "Error" in result.stderr or result.returncode != 0, (
-            f"Expected error with small buffer, got: {result.stderr}"
-        )
+        # The oversized message should be skipped with a warning (graceful recovery).
+        # Prior to the LimitOverrunError fix, this would crash; now it logs and continues.
+        assert (
+            "oversized" in result.stderr.lower() or "buffer limit" in result.stderr.lower() or result.returncode != 0
+        ), f"Expected warning about oversized message or error, got: {result.stderr}"
 
         # Test 2: Large buffer (200KB) succeeds with large message (70KB)
         large_agent = os.path.join(tmpdir, "large_agent.py")

tests/test_connection_recovery.py

@@ -156,7 +156,9 @@ async def test_receive_loop_logs_warning_on_oversized_message(caplog: pytest.Log
     with caplog.at_level("WARNING"):
         await conn._receive_loop()
 
-    assert any("oversized" in record.message.lower() or "buffer limit" in record.message.lower() for record in caplog.records)
+    assert any(
+        "oversized" in record.message.lower() or "buffer limit" in record.message.lower() for record in caplog.records
+    )
     await conn.close()