Adds a GitHub Actions workflow that:
- Creates 'cla: pending' and 'cla: signed' labels
- Auto-labels PRs based on CLA check status
- Posts reminder comment after 7 days if CLA unsigned
- Posts close warning at 23 days
- Auto-closes PRs after 30 days with unsigned CLA
Triggers:
- Real-time on check_run completion (license/cla)
- On PR open/sync/reopen
- Daily scheduled sweep at 9 AM UTC
- Manual workflow_dispatch for testing
Configurable timing via env vars (REMINDER_DAYS, CLOSE_DAYS).
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