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/flow-splitter.md

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+# FlowSplitter
+
+Config type: `"FlowSplitter"`  
+Source: `crates/components/src/flow_splitter.rs` (or equivalent)
+
+---
+
+## EN
+
+### Purpose & model
+
+One inlet → **N outlets**. Mass splits across outlet legs; pressure continuous at the node (common header assumption unless specialized ΔP models exist).
+
+```
+ṁ_in = Σ ṁ_out,i
+P_out,i = P_in   (ideal splitter)
+h_out,i = h_in   (same enthalpy)
+```
+
+### Residuals & `n_equations()`
+
+Mass split + equal-P / equal-h constraints per topology. Port count depends on `n_outlets` configuration.
+
+### Ports
+
+| Port | Role |
+|------|------|
+| `inlet` | single inlet |
+| `outlet_0` … `outlet_{n-1}` | outlets |
+
+### Calibration
+
+None by default.
+
+### JSON
+
+| Key | Meaning | Default |
+|-----|---------|---------|
+| `n_outlets` | number of legs | ≥ 2 |
+
+---
+
+## FR
+
+### But
+
+**Séparateur de débit** 1 → N. Conservation de ṁ ; même P/h idéalement.
+
+### Ports / JSON
+
+Voir EN.