feat(core): add symbolic equation isolation engine for algebraic loop reduction

nachawati · nachawati · commit 1204286845e5 · 2026-03-30T19:53:25.000+03:00
diff --git a/packages/core/src/compiler/modelica/blt.ts b/packages/core/src/compiler/modelica/blt.ts
@@ -267,6 +267,8 @@ export function performBltTransformation(dae: ModelicaDAE): {
                 const idx = sccEqs.indexOf(matchingEq);
                 if (idx >= 0) sccEqs[idx] = isolated;
                 equations[eqIdx] = isolated;
+                // Propagate back to the original DAE so output uses the isolated form
+                dae.equations[eqIdx] = isolated;
               } else {
                 // implicit single variable loop — cannot isolate
                 algebraicLoops.push({ variables: scc, equations: sccEqs });
