fix: paths-only skips branch validation, setup-plan preserves existing plan#2672

mnriem merged 4 commits into

github:maingithub/spec-kit:mainfrom

mnriem:fix/2653-shell-script-paths-only-and-plan-overwritemnriem/spec-kit:fix/2653-shell-script-paths-only-and-plan-overwriteCopy head branch name to clipboard