fix(cli): don't self-upgrade uv tool installs on Windows - #5149

fix(cli): don't self-upgrade uv tool installs on Windows#5149

jaeminbird wants to merge 3 commits into

github:maingithub/spec-kit:mainfrom

jaeminbird:fix/5141-windows-uv-tool-self-upgradejaeminbird/spec-kit:fix/5141-windows-uv-tool-self-upgradeCopy head branch name to clipboard