Copilot BYOK Switcher 0.2.0

What's changed

• Add -v / --version while preserving -- --version forwarding to GitHub Copilot CLI.
• Replace raw missing-binary failures with an actionable Copilot CLI installation message.
• Expand interactive, help, version, and launch-failure test coverage.
• Improve CI triggers, repository guidance, release documentation, and maintenance hygiene.

Validation

• Local lint, 45 tests, coverage, package inspection, dependency audits, secret scan, and isolated tarball installation passed.
• CI passed on Node.js 22 and 24 across Linux, Windows, and macOS; CodeQL passed with no open alerts.