Initial commit: establish deterministic rod-string solver stack.

Set up the C solver core, Node API orchestration, TS GUI workflow, and engineering documentation with cleaned repo hygiene for private Git hosting.

Made-with: Cursor

gui-ts/src/ui/common/RadioGroup.tsx

@@ -0,0 +1,29 @@
+export type RadioOption<V extends string> = { value: V; label: string };
+
+export type RadioGroupProps<V extends string> = {
+  name: string;
+  value: V;
+  onChange: (value: V) => void;
+  options: Array<RadioOption<V>>;
+  disabled?: boolean;
+};
+
+export function RadioGroup<V extends string>(props: RadioGroupProps<V>) {
+  return (
+    <div className="panel-radio-group" role="radiogroup">
+      {props.options.map((opt) => (
+        <label key={opt.value} className="panel-radio">
+          <input
+            type="radio"
+            name={props.name}
+            value={opt.value}
+            checked={props.value === opt.value}
+            disabled={props.disabled}
+            onChange={() => props.onChange(opt.value)}
+          />
+          <span>{opt.label}</span>
+        </label>
+      ))}
+    </div>
+  );
+}