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/util-agent/__tests__/context.test.ts

@@ -1,4 +1,5 @@
-import { describe, expect, test } from 'vitest';
+import { describe, expect, test } from "vitest";
+
 // We need to test buildHistory indirectly through buildContext
 // since buildHistory is not exported. For now, we'll test the integration
 // through the public API in a separate integration test.