Snapshot WIP: solver HP epic progress, BPHX/HX physics, BMAD skill refresh.

Capture uncommitted solver robustness work (regularization, domain errors, linear solver lifecycle, tube DP/MSH), web workbench updates, and synced BMAD skills across IDE agent folders before starting BPHX pressure-drop.

Co-authored-by: Cursor <cursoragent@cursor.com>

.entropyk/modules/BaseChiller.ekmod

@@ -0,0 +1,85 @@
+{
+  "params": {
+    "fluid": "R134a",
+    "ua_cond": 766,
+    "ua_evap": 1468
+  },
+  "components": [
+    {
+      "type": "IsentropicCompressor",
+      "name": "comp",
+      "isentropic_efficiency": 0.7,
+      "emergent_pressure": true,
+      "displacement_m3": 0.000065,
+      "speed_hz": 50,
+      "volumetric_efficiency": 0.92,
+      "t_cond_k": 318.15,
+      "t_evap_k": 278.15,
+      "superheat_k": 5
+    },
+    {
+      "type": "Condenser",
+      "name": "cond",
+      "fluid": "$fluid",
+      "secondary_fluid": "Water",
+      "ua": "$ua_cond",
+      "t_sat_k": 323.15,
+      "secondary_inlet_temp_c": 30,
+      "secondary_mass_flow_kg_s": 2,
+      "secondary_cp_j_per_kgk": 4186,
+      "secondary_humidity_ratio": 0,
+      "dp_model": "quadratic",
+      "rated_pressure_drop_pa": 15000,
+      "rated_mass_flow_kg_s": 0.05,
+      "secondary_rated_pressure_drop_pa": 30000,
+      "secondary_rated_m_flow_kg_s": 0.45,
+      "emergent_pressure": true,
+      "subcooling_k": 5,
+      "skip_pressure_eq": false,
+      "z_ua": 1,
+      "z_dp": 1
+    },
+    {
+      "type": "IsenthalpicExpansionValve",
+      "name": "exv",
+      "t_evap_k": 278.15,
+      "opening": 0.5,
+      "emergent_pressure": true
+    },
+    {
+      "type": "Evaporator",
+      "name": "evap",
+      "fluid": "$fluid",
+      "secondary_fluid": "Water",
+      "ua": "$ua_evap",
+      "t_sat_k": 275.15,
+      "superheat_k": 5,
+      "z_ua": 1,
+      "z_dp": 1,
+      "secondary_inlet_temp_c": 12,
+      "secondary_mass_flow_kg_s": 1.5,
+      "secondary_cp_j_per_kgk": 4186,
+      "secondary_humidity_ratio": 0,
+      "dp_model": "quadratic",
+      "rated_pressure_drop_pa": 15000,
+      "rated_mass_flow_kg_s": 0.05,
+      "secondary_rated_pressure_drop_pa": 30000,
+      "secondary_rated_m_flow_kg_s": 0.5,
+      "emergent_pressure": true,
+      "superheat_regulated": false,
+      "skip_pressure_eq": false
+    }
+  ],
+  "edges": [
+    {"from": "comp:outlet", "to": "cond:inlet"},
+    {"from": "cond:outlet", "to": "exv:inlet"},
+    {"from": "exv:outlet", "to": "evap:inlet"},
+    {"from": "evap:outlet", "to": "comp:inlet"}
+  ],
+  "ports": {
+    "chw_in": "evap:secondary_inlet",
+    "chw_out": "evap:secondary_outlet",
+    "cond_water_in": "cond:secondary_inlet",
+    "cond_water_out": "cond:secondary_outlet"
+  }
+}