Adopt project maintenance standards

[Pratiyush]

Project Maintenance Standards Adoption

Current Status

LICENSE, CONTRIBUTING, CHANGELOG, issue templates (5), PR template, CI workflows (2) -- all present.

Missing Items

Security

• Add SECURITY.md with disclosure process

CI/CD Enhancements

• Add automated link checking via GitHub Actions
• Add stale issue bot (actions/stale, 90-day auto-close)

Documentation

• Add badges (last verified date, total entries count)

Housekeeping

• Add Dependabot or Renovate (if any deps)
• Enable branch protection on master

Priority: Low effort -- mostly there already