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>

docs/components/pipe.md

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+# Pipe
+
+Config type: `"Pipe"`  
+Source: `crates/components/src/pipe.rs`
+
+---
+
+## EN
+
+### Purpose & model
+
+Fluid duct with **friction pressure drop** (Darcy/Colebrook-style or equivalent implementation) and near-isenthalpic or adiabatic energy transport:
+
+```
+ΔP = f(L, D, ε, Re, ṁ, ρ)
+h_out ≈ h_in   (or with small heat loss if modeled)
+```
+
+### Residuals & `n_equations()`
+
+Pressure-drop residual + energy residual (typically **2** on a series branch).
+
+### Ports
+
+`inlet` / `outlet`.
+
+### Calibration
+
+`z_dp` (or equivalent) scales ΔP when exposed via calib — default **1.0**.
+
+### JSON (main)
+
+| Key | Meaning | Default |
+|-----|---------|---------|
+| `length_m` | length | required |
+| `diameter_m` | inner diameter | required |
+| `roughness_m` | roughness | small metal default |
+| fluid | water / refrigerant path | from circuit |
+
+---
+
+## FR
+
+### But & modèle
+
+**Conduite** avec pertes de charge et transport d’enthalpie.
+
+### Calibration
+
+Facteur de perte de charge (défaut 1).
+
+### JSON
+
+Voir EN.