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>

crates/entropyk/tests/api_usage.rs

@@ -4,11 +4,10 @@
 //! API ergonomics using real component types.
 
 use entropyk::{System, SystemBuilder, ThermoError};
-use entropyk_components::{
-    Component, ComponentError, JacobianBuilder, ResidualVector,
-};
+use entropyk_components::{Component, ComponentError, JacobianBuilder, ResidualVector};
 
 struct MockComponent {
+    #[allow(dead_code)] // Identifies the fixture instance; not asserted in these tests.
     name: &'static str,
     n_eqs: usize,
 }
@@ -143,7 +142,7 @@ fn test_builder_into_inner() {
 #[test]
 fn test_direct_system_api() {
     let mut system = System::new();
-    let idx = system.add_component(Box::new(MockComponent {
+    let _idx = system.add_component(Box::new(MockComponent {
         name: "test",
         n_eqs: 2,
     }));