完善流量控制前馈、稳态判定与阀门标定流程

- 前馈冻结改用可配置的 3 秒流量绝对误差滑窗，修复采样抖动造成的重复解冻，并保留下游扰动后的自动更新
- 支持非单调阀特性反解、最小可测面积以下直接全关，以及闭阀端精细扫点与辨识开关
- 调整双压力判稳、最长等待时间、在线入口全开收尾和闭环四联图
- 更新配置、README、阀模型及离线测试，归档本轮实验数据与诊断产物

test_performance_reporter.py

@@ -0,0 +1,59 @@
+from types import SimpleNamespace
+
+from performance_reporter import PerformanceReporter
+
+
+class _Pid:
+    kp = 1.0
+    ki = 0.1
+    kd = 0.0
+
+
+def _result(timestamp, flow, pressure_before, pressure_after, target=100.0):
+    return SimpleNamespace(
+        status="OK",
+        timestamp=timestamp,
+        measured_flow_slm=flow,
+        target_flow_slm=target,
+        pressure_before_kpa=pressure_before,
+        pressure_kpa=pressure_after,
+    )
+
+
+def _reporter():
+    return PerformanceReporter(
+        _Pid(),
+        window_s=0.2,
+        sample_period_s=0.1,
+        band_pct=1.0,
+        pressure_band_kpa=1.0,
+        flow_range_min_slm=0.0,
+        flow_range_max_slm=300.0,
+    )
+
+
+def test_steady_uses_pressure_band_instead_of_flow_std():
+    reporter = _reporter()
+    # 流量标准差很大，但窗口均值为目标值；压力均在各自均值 ±1 kPa 内。
+    reporter.observe(_result(0.0, 50.0, 200.0, 100.0))
+    reporter.observe(_result(0.1, 150.0, 201.0, 99.0))
+
+    assert reporter.steady_reached
+    assert reporter.steady_mean == 100.0
+    assert reporter.steady_std == 50.0
+
+
+def test_pressure_outside_mean_band_prevents_steady_state():
+    reporter = _reporter()
+    reporter.observe(_result(0.0, 100.0, 200.0, 100.0))
+    reporter.observe(_result(0.1, 100.0, 203.0, 100.0))
+
+    assert not reporter.steady_reached
+
+
+def test_missing_pressure_sample_is_not_used_for_steady_state():
+    reporter = _reporter()
+    reporter.observe(_result(0.0, 100.0, None, 100.0))
+    reporter.observe(_result(0.1, 100.0, 200.0, 100.0))
+
+    assert not reporter.steady_reached