## Summary
- Reject blank and whitespace-only `delete_file` paths at schema level.
- Add runtime guard to refuse project-root-equivalent delete targets
(like `.`, `./`, `.\\`, or normalized `foo/..`).
- Add unit tests covering root-path rejection and normal file/directory
delete behavior.

## Test plan
- [x] `npm test --
src/pro/main/ipc/handlers/local_agent/tools/delete_file.spec.ts`
- [x] `npm run fmt && npm run lint:fix && npm run ts`


Made with [Cursor](https://cursor.com)
<!-- devin-review-badge-begin -->

---

<a href="https://app.devin.ai/review/dyad-sh/dyad/pull/2859"
target="_blank">
  <picture>
<source media="(prefers-color-scheme: dark)"
srcset="https://static.devin.ai/assets/gh-open-in-devin-review-dark.svg?v=1">
<img
src="https://static.devin.ai/assets/gh-open-in-devin-review-light.svg?v=1"
alt="Open with Devin">
  </picture>
</a>
<!-- devin-review-badge-end -->