chore: keep latency tests diff-clean

tests/test_live_snapshot.py

@@ -1106,4 +1106,3 @@ def test_strict_latency_validation_backend_rejects_malformed():
     assert main._measured_latency_ms(0.0004) == 0  # sub-ms rounds to 0, no 1ms floor
     assert main._measured_latency_ms(-1.0) is None
     assert main._measured_latency_ms(float("inf")) is None
-