Add "Todo Tracker" check

[continue]

Adds the Todo Tracker check to this repository.

This check will be synced from .continue/checks/todo-tracker.md and can be customized by editing the file directly.

---

Opened via Continue Hub

---

Summary by cubic

Adds an automated Todo Tracker that scans TODOs in PR changes, creates GitHub issues, and updates inline comments with issue numbers. It also posts or updates a single tracker comment on the PR with results.

• New Features
  • Configured via .continue/checks/todo-tracker.md.
  • Scans changed files for TODOs; skips ones with existing issue numbers.
  • Creates issues and links them inline (e.g., // TODO(#123): ...), preserving style and indentation.
  • Commits updates and posts/updates one PR comment marked <!-- tech-debt-tracker -->.
  • Handles edge cases (no TODOs, existing tracker comment, API errors, rate limits).

^{Written for commit 72b6876. Summary will update on new commits. Review in cubic}

[google-cla]

Thanks for your pull request! It looks like this may be your first contribution to a Google open source project. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

View this failed invocation of the CLA check for more information.

For the most up to date status, view the checks section at the bottom of the pull request.