Polish Multi-CLI v1 release surface

[Spielewoy]

Summary

• rebuild the README and translated docs around the v1 release layout
• add community files, labels, release workflows, and packaged release assets
• tighten install, uninstall, AppX, and profile safety coverage and validations

Verification

• powershell -NoProfile -ExecutionPolicy Bypass -File tests/run-pester.ps1
• 'C:\Program Files\Git\bin\bash.exe' tests/run-bats.sh
• python scripts/validate-docs.py
• powershell -NoProfile -ExecutionPolicy Bypass -File scripts/Validate-Adapters.ps1
• 'C:\Program Files\Git\bin\bash.exe' scripts/validate-adapters.sh
• 'C:\Program Files\Git\bin\bash.exe' scripts/release-build.sh --check
• powershell -NoProfile -ExecutionPolicy Bypass -File scripts/release-build.ps1 -Check
• python -m pytest tests/coverage -q