Fix critical issues in install.sh script - syntax errors, shellcheck warnings, and add version detection fallback#6

ziflex merged 4 commits intomaingo-waitfor/cli:mainfrom

copilot/fix-60a5336a-ce4b-4294-a595-945dbb68f82bgo-waitfor/cli:copilot/fix-60a5336a-ce4b-4294-a595-945dbb68f82bCopy head branch name to clipboard