Deploy Rails applications with Kamal (Docker + SSH). Use when: (1) Creating or modifying deploy.yml configuration, (2) Setting up new server deployments, (3) Configuring kamal-proxy, SSL, or accessories, (4) Writing deployment hooks, (5) Managing secrets with 1Password/Bitwarden/LastPass, (6) Troubleshooting deployment issues, (7) Setting up multi-server or multi-destination deployments.