C内核流量计算方法优化，前端文件名称读取优化

tests/test_native_pipe_physics.py

@@ -152,8 +152,8 @@ int main(void) {
                         self.assertLess(abs(sum(rates)),1e-10+sum(map(abs,rates))*1e-12)
 
     def test_web_stream_completes_mql4_and_matches_amesim_reference(self):
-        reference=json.loads((ROOT/'tests/data/test-mql-4-amesim-reference.json').read_text())
-        xml=(ROOT/'tests/data/test-mql-4-corrected.xml').read_bytes()
+        reference=json.loads((ROOT/'tests/baselines/simulation/test_mql_4/test-mql-4-amesim-reference.json').read_text())
+        xml=(ROOT/'tests/fixtures/amesim/test-mql-4-corrected.xml').read_bytes()
         events=[json.loads(line) for line in simulation_event_stream(xml)]
         self.assertFalse([e for e in events if e['event']=='error'])
         self.assertTrue(any(e['event']=='progress' for e in events))
@@ -161,7 +161,7 @@ int main(void) {
         self.assertTrue(result['success'],result['message'])
         self.assertEqual(result['simulatedUntil'],10)
         self.assertEqual(result['diagnostics']['backend'],'native-c')
-        self.assertEqual(result['diagnostics']['integration']['rtol'],1e-7)
+        self.assertEqual(result['diagnostics']['integration']['rtol'],1e-8)
         self.assertEqual(result['diagnostics']['integration']['method'],'BDF')
         self.assertEqual(result['diagnostics']['stateCount'],64)
         # Bound the formerly stalled tiny-step failure by work, not machine time.