added validator for rjsf, hook form via standard schema

app/__test__/flows/SubWorkflowTask.spec.ts

@@ -1,6 +1,6 @@
 import { describe, expect, test } from "bun:test";
 import { Flow, LogTask, SubFlowTask, RenderTask, Task } from "../../src/flows";
-import { Type } from "@sinclair/typebox";
+import { s } from "core/object/schema";
 
 export class StringifyTask<Output extends string> extends Task<
    typeof StringifyTask.schema,
@@ -8,11 +8,9 @@ export class StringifyTask<Output extends string> extends Task<
 > {
    type = "stringify";
 
-   static override schema = Type.Optional(
-      Type.Object({
-         input: Type.Optional(Type.String()),
-      }),
-   );
+   static override schema = s.object({
+      input: s.string().optional(),
+   });
 
    async execute() {
       return JSON.stringify(this.params.input) as Output;