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>

demo/src/bin/chiller.rs

@@ -15,9 +15,7 @@
 
 use colored::Colorize;
 use entropyk_components::heat_exchanger::{CondenserCoil, Evaporator};
-use entropyk_components::{
-    Component, ComponentError, JacobianBuilder, ResidualVector, StateSlice,
-};
+use entropyk_components::{Component, ComponentError, JacobianBuilder, ResidualVector, StateSlice};
 use entropyk_core::{MassFlow, Pressure, Temperature, ThermalConductance};
 use entropyk_solver::{
     compute_coupling_heat, coupling_groups, has_circular_dependencies, System, ThermalCoupling,

demo/src/bin/thermal_coupling.rs

@@ -8,9 +8,7 @@
 //! - Heat transfer computation
 
 use colored::Colorize;
-use entropyk_components::{
-    Component, ComponentError, JacobianBuilder, ResidualVector, StateSlice,
-};
+use entropyk_components::{Component, ComponentError, JacobianBuilder, ResidualVector, StateSlice};
 use entropyk_core::{Temperature, ThermalConductance};
 use entropyk_solver::{
     compute_coupling_heat, coupling_groups, has_circular_dependencies, CircuitId, System,