- add hasTokenFile() for fast auth check without subprocess
- capture device code from copilot-api auth output
- export AuthFlowResult type with deviceCode and verificationUrl
- echo auth output to terminal while capturing for UI
- copilot-auth: use getCopilotApiBinPath() instead of npx
- copilot-daemon: move PID file to ~/.ccs/copilot/daemon.pid
- copilot-executor: auto-install copilot-api on first use
- index: export package manager functions