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/solver/tests/traceability.rs

@@ -2,7 +2,7 @@ use entropyk_components::port::{FluidId, Port};
 use entropyk_components::{Component, ComponentError, ConnectedPort, JacobianBuilder, StateSlice};
 use entropyk_core::{Enthalpy, Pressure};
 use entropyk_solver::solver::{NewtonConfig, Solver};
-use entropyk_solver::system::System;
+use entropyk_solver::system::{System, DEFAULT_MASS_FLOW_SEED_KG_S};
 
 struct DummyComponent {
     ports: Vec<ConnectedPort>,
@@ -79,8 +79,18 @@ fn test_simulation_metadata_outputs() {
 
     let input_hash = sys.input_hash();
 
+    // CM1.2: seed each edge's mass-flow slot so the temporary ṁ closures are
+    // satisfied at the start (DummyComponent residuals are all zero), letting the
+    // solver recognise convergence without inverting the singular dummy Jacobian.
+    let mut initial_state = vec![0.0; sys.full_state_vector_len()];
+    // Refrigerant edges have stride 3 with ṁ first; seed every ṁ slot.
+    for m in (0..initial_state.len()).step_by(3) {
+        initial_state[m] = DEFAULT_MASS_FLOW_SEED_KG_S;
+    }
+
     let mut solver = NewtonConfig {
         max_iterations: 5,
+        initial_state: Some(initial_state),
         ..Default::default()
     };
     let result = solver.solve(&mut sys).unwrap();