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/docs/components/boundaries.md

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+# Boundaries — Sources & Sinks / Frontières
+
+Config types: `RefrigerantSource`, `RefrigerantSink`, `BrineSource`, `BrineSink`, `AirSource`, `AirSink`  
+Sources: `refrigerant_boundary.rs`, `brine_boundary.rs`, `air_boundary.rs`
+
+---
+
+## EN
+
+Boundary components fix **Dirichlet** conditions on one edge.  
+**Source** = one outlet; **Sink** = one inlet. These are the natural place to **FIX** machine inputs (T, P, ṁ).
+
+### RefrigerantSource / RefrigerantSink
+
+```
+Source: P = P_set ; h = h(P, x)           n ≈ 2
+Sink:   P = P_back ; optional h if x set    n ≈ 1–2
+```
+
+| Key | Meaning | Default |
+|-----|---------|---------|
+| `fluid` | refrigerant | primary |
+| `p_set_bar` / `p_back_bar` | pressure | ~10 bar typical |
+| `quality` | vapor quality | 1.0 source |
+
+### BrineSource / BrineSink (water / glycol)
+
+```
+Source: P, h(T), optional ṁ_set     n = 2 or 3
+Sink:   P_back, optional T/h, ṁ     n = 1–3
+```
+
+| Key | Meaning | Default |
+|-----|---------|---------|
+| `fluid` | Water / MEG / … | Water |
+| `p_set_bar` / `p_back_bar` | pressure | 2 bar |
+| `t_set_c` | temperature | 12 °C (source) |
+| `concentration` | glycol mass % | 0 |
+| `m_flow_kg_s` | imposed loop flow (BOLT `Vd_fixed`) | optional |
+
+**Do not** combine `m_flow_kg_s` with another flow imposition on the same branch (pump curve + fixed ṁ → over-constrained).
+
+### AirSource / AirSink
+
+Psychrometric state (Magnus–Tetens style humidity + moist air enthalpy):
+
+```
+h ≈ 1006·T_c + W·(2.501e6 + 1860·T_c)
+Source: fix P, h(T, RH)     n = 2
+```
+
+| Key | Meaning | Default |
+|-----|---------|---------|
+| `t_dry_c` / `t_set_c` | dry-bulb | – |
+| `rh` | relative humidity | – |
+| `p_set_bar` | pressure | ~1 bar |
+| `m_flow_kg_s` | optional mass flow | – |
+
+### System wiring for HX secondary
+
+```
+BrineSource.outlet → HX.secondary_inlet
+HX.secondary_outlet → BrineSink.inlet
+```
+
+Without live wiring, HX may still run in **rating** mode with scalar secondary_* on the HX itself.
+
+### Calibration
+
+Boundaries generally have **no Z-factors**. They are pure Fixed inputs / back-pressure.
+
+---
+
+## FR
+
+### Rôle
+
+Imposent les **conditions aux limites** (P, T, ṁ). C’est là qu’on **fixe** les entrées machine.
+
+### Eau (Brine)
+
+Source : P, T, ṁ optionnel. Sink : contre-pression (T sortie souvent **libre** = émergente).
+
+### Air
+
+État psychrométrique (T sèche, HR → h).
+
+### Câblage HX
+
+Source → secondary_in → secondary_out → Sink pour le mode système.
+
+### JSON
+
+Voir tableaux EN.