chore: integrate proman scaffold

- Add proman.yaml with 8 packages in dependency order
- Add @shazhou/proman as devDependency
- Replace root scripts: build/test/check/format → proman commands
- Keep typecheck script for standalone tsc --build

Fixes #27

packages/agent-builtin/__tests__/prompt.test.ts

@@ -1,5 +1,5 @@
-import { describe, expect, test } from 'vitest';
 import type { AgentContext } from "@united-workforce/util-agent";
+import { describe, expect, test } from "vitest";
 
 import { buildBuiltinMessages } from "../src/prompt.js";