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>

crates/fluids/coolprop-sys/src/lib.rs

@@ -387,11 +387,7 @@ pub unsafe fn is_fluid_available(fluid: &str) -> bool {
     let fluid_c = CString::new(fluid).unwrap();
     // CoolProp C API does not expose isfluid, so we try fetching a property
     let res = Props1SI(fluid_c.as_ptr(), c"Tcrit".as_ptr());
-    if res.is_finite() && res != 0.0 {
-        true
-    } else {
-        false
-    }
+    res.is_finite() && res != 0.0
 }
 
 /// Get CoolProp version string.