Operational skill that installs OneCLI, configures the Agent Vault gateway, and migrates existing .env credentials into the vault. Designed to run after /update-nanoclaw introduces OneCLI as a breaking change. Added [BREAKING] changelog entry so update-nanoclaw automatically offers to run /init-onecli. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>