Function mutate

ts/workflow-builder/src/utils/functionOperations.ts:43–53

* Apply an update to one function. `bumpVersion` is true for signature changes * (name/arguments/outputs declaration) so call sites detect staleness, and false for * pure output-expression edits. Version-bumping changes re-sync the body's fnargs.

(id: string, updater: (fn: FunctionDeclaration) => FunctionDeclaration, bumpVersion: boolean)

 * pure output-expression edits. Version-bumping changes re-sync the body's fnargs.
 */
function mutate(id: string, updater: (fn: FunctionDeclaration) => FunctionDeclaration, bumpVersion: boolean): void {
  let next: FunctionDeclaration | undefined;
  useEditorStore.getState().setFunctions((fns) => {
    const fn = fns[id];
    if (!fn) return fns;
    const updated = updater(fn);
    next = bumpVersion ? { ...updated, version: fn.version + 1 } : updated;
    return { ...fns, [id]: next };
  });
  if (next && bumpVersion) syncBody(next);
}

/** Create a new (empty) function + its body canvas. Returns the new definition. */
export function addFunction(): FunctionDeclaration {