Add stale PR bot - remind contributors after 7 days of no activity

[Ayush-Patel-56]

Problem

PRs sometimes sit open for weeks with no updates. Maintainers have to chase people manually.

What should happen

A workflow that runs on a schedule, checks open PRs, and posts a reminder if there has been no push or comment in 7 days:

• After 7 days: post a check-in comment asking if it is still in progress
• After 14 days: add a stale label

Implementation notes

GitHub has a first-party actions/stale action that handles most of this. Add it as a new workflow file in .github/workflows/

[Krirox]

Hi
I’d love to work on this issue.
I have experience with GitHub Actions and workflow automation, and I can implement the stale PR reminder flow cleanly with proper scheduling and labeling.

Could you please assign this issue to me? Thanks!