When starting kctl-tui without a subcommand, check GitHub Releases
for a newer version and prompt the user to update.
- Silent skip for dev builds and network errors
- Prompt: 'Update now? [y/N]'
- On 'y': apply update, then start TUI
- On 'N'/Enter: start TUI immediately
Add 'kctl-tui update' subcommand that checks GitHub Releases for
new versions and replaces the running binary.
Uses github.com/creativeprojects/go-selfupdate for safe binary
replacement with automatic OS/arch detection.
Supports --verbose flag for detailed update progress logging.
stefankoelle
renovate[bot]
Stefan Koelle