GitHub modernization tracker (profile + repos + workflows)

## Program objective
Track modernization tasks across profile branding, repository hygiene, security, and workflows.

## Completed in this sprint
- [x] Backup branch created before site changes
- [x] Homepage modernization PR created and merged
- [x] GitHub Pages landing updated to profile-aligned layout

## Next tasks
- [ ] Optional README-to-site content sync automation (GitHub Actions)
- [ ] Pin top repositories on profile
- [ ] Add repo standards templates where missing
- [ ] Enable/verify Dependabot + secret scanning + branch protections in active repos
- [ ] Add devcontainer for active repositories for Codespaces
- [ ] Classify old repos: keep/archive/delete
- [ ] Execute archive/delete cleanup only with explicit confirmation

## Notes
- Created by Copilot via MCP as part of modernization plan execution.