Add a new AI Agent skill for detecting and managing stale issues and PRs:
- SKILL.md - main skill guide
- README.md - overview documentation
- examples/ - AI judgment demo, PR stale workflow, weekly cleanup workflow
- references/ - scan, judge, actions, and exempt rules
The skill automates stale detection with AI-powered judgment and supports
weekly cleanup workflows with configurable exemption rules.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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