v1.4.0

✨ Added

• Enables programmatic access to skillctrl via a Headless CLI without breaking the existing interactive menu.
• Added direct commands (list, deploy, import, update) powered by commander.
• Via the --json global flag, guaranteeing that stdout is exclusively parseable JSON, while telemetry and errors are routed to stderr.
• Added robust process exit code handling and graceful signal termination handling.