高温氦气物性补全；三通四通能量计算bug修正

tests/test_amesim_pnl0002_pnl0003_component.py

@@ -1,3 +1,8 @@
+"""Legacy Python-kernel test placeholder; contains no executable test cases.
+
+Native coverage lives in test_amesim_pnl0002_pnl0003_xml,
+test_amesim_semantics, test_native_pipe_physics, and test_native_catalog.
+"""
 from __future__ import annotations
 
 import unittest