Update llms.txt for model options in FEAScriptWorker

setModelConfig and solve take the same options as FEAScriptModel, so
every model can run in the worker. Note that coefficient functions must
not use outer variables and that a Content Security Policy must allow
'unsafe-eval'.

Author: nikoscham

static/llms.txt

@@ -211,15 +211,18 @@ Newton–Raphson (nonlinear general form, front propagation): defaults `maxItera
 ```javascript
 const worker = new FEAScriptWorker();
 await worker.ping();
-await worker.setModelConfig("frontPropagationScript"); // Model name only, no options
+await worker.setModelConfig("frontPropagationScript"); // Same options as FEAScriptModel.setModelConfig
 await worker.setMeshConfig({ meshDimension: "2D", elementOrder: "quadratic", numElementsX: 12, numElementsY: 8, maxX: 4, maxY: 2 });
 await worker.addBoundaryCondition("0", ["constantValue", 0]);
-const result = await worker.solve();
+const result = await worker.solve(); // Optional { maxIterations, tolerance }
 plotSolution(await worker.getModelInfo(), result, "contour", "plotDiv");
 worker.terminate();
 ```
 
-`FEAScriptWorker` cannot take model options (no `coefficientFunctions`, `nonlinear`, `maxIterations` or `tolerance`), so models that need coefficient functions cannot run in it.
+- Every method is async. `setModelConfig(name, options)` and `solve(options)` take the same options as `FEAScriptModel`, so every model can run in the worker.
+- Coefficient functions are sent to the worker as source code and rebuilt there, so they **must be self-contained**: write values into the function (`D: (x, u) => 0.5 * u ** 2`), never refer to outer variables (`D: (x, u) => Da * u ** 2` fails in the worker with `Da is not defined`). Wrap built-in functions: `(x) => Math.sin(x)`, not `Math.sin`.
+- Rebuilding the functions needs `eval`: a page with a Content Security Policy must allow `'unsafe-eval'`.
+- `solveAsync` and the `"jacobi-gpu"` method are not available through the worker.
 
 ## Errors and logging