chore(release): bump version to v2026.4.639 and update changelog}
- Bump package version from v2026.4.637 to v2026.4.639
- Update p3x-redis-ui-material dependency from ^2026.4.410 to ^2026.4.411
- Update p3x-redis-ui-server dependency from ^2026.4.344 to ^2026.4.345
- Add v2026.4.639 changelog entry: server-side AI command execution with bash pipe support
- Update build version references across README, artifacts, and changelog docs
- Remove temporary .changelog-prompt.tmp file
- Update yarn.lock with new dependency resolutions