Add diagram workbench UI with Modelica DoF coaching and ISO glyphs.

Ship the Next.js cycle editor with CAD chrome, technical HX symbols, Fixed/Free boundary guidance, and secondary water/air pressure drop support in the solver stack.

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

apps/web/public/examples/hx_air_water_4port.json

@@ -0,0 +1,88 @@
+{
+  "name": "Four-Port Air-Water Heat Exchanger",
+  "fluid": "Water",
+  "fluid_backend": "CoolProp",
+  "circuits": [
+    {
+      "id": 0,
+      "components": [
+        {
+          "type": "BrineSource",
+          "name": "hot_water_in",
+          "fluid": "Water",
+          "p_set_bar": 2.0,
+          "t_set_c": 60.0,
+          "m_flow_kg_s": 0.5
+        },
+        {
+          "type": "HeatExchanger",
+          "name": "hx",
+          "ua": 3000.0,
+          "hot_fluid_id": "Water",
+          "cold_fluid_id": "Air",
+          "cold_humidity_ratio": 0.010
+        },
+        {
+          "type": "BrineSink",
+          "name": "hot_water_out",
+          "fluid": "Water",
+          "p_back_bar": 2.0
+        },
+        {
+          "type": "AirSource",
+          "name": "cold_air_in",
+          "p_set_bar": 1.01325,
+          "t_dry_c": 20.0,
+          "rh": 50.0,
+          "m_flow_kg_s": 1.0
+        },
+        {
+          "type": "Fan",
+          "name": "supply_fan",
+          "fluid": "Air",
+          "speed_ratio": 1.0,
+          "air_density_kg_per_m3": 1.204,
+          "design_flow_m3_s": 0.83,
+          "curve_p0": 250.0,
+          "curve_p1": 0.0,
+          "curve_p2": -20.0,
+          "eff_e0": 0.65,
+          "eff_e1": 0.0,
+          "eff_e2": 0.0
+        },
+        {
+          "type": "AirSink",
+          "name": "cold_air_out",
+          "p_back_bar": 1.01325
+        }
+      ],
+      "edges": [
+        {
+          "from": "hot_water_in:outlet",
+          "to": "hx:hot_inlet"
+        },
+        {
+          "from": "hx:hot_outlet",
+          "to": "hot_water_out:inlet"
+        },
+        {
+          "from": "cold_air_in:outlet",
+          "to": "supply_fan:inlet"
+        },
+        {
+          "from": "supply_fan:outlet",
+          "to": "hx:cold_inlet"
+        },
+        {
+          "from": "hx:cold_outlet",
+          "to": "cold_air_out:inlet"
+        }
+      ]
+    }
+  ],
+  "solver": {
+    "strategy": "newton",
+    "max_iterations": 300,
+    "tolerance": 1e-6
+  }
+}