Summary

• add CI, release, Go, and MIT shields to a compact project header
• make the one-line installation path prominent
• show the current tab interface accurately
• explain session selection and creation in a three-step quickstart
• keep platform setup, alternative installs, troubleshooting, and development details collapsible

Verification

• rendered with the GitHub Markdown API
• inspected on the public GitHub branch page
• checked all badge, release, installer, and project links
• go test ./...
• GitHub CI passed on Ubuntu, macOS, and Windows, including the tmux integration job