v0.2.0

Added

• ncserver renew: forces a token refresh and persists the updated refresh token to disk; prevents offline token expiry from inactivity
• systemd units in contrib/systemd/: ncserver-token-renew.service and ncserver-token-renew.timer for weekly automated token renewal

Fixed

• Rotated refresh tokens are now persisted to the config file after every API call, preventing authentication failures when the SCP auth server issues a new refresh token
• Failover for IPv6 nets