Deepsky Sustain CLI

Use deepsky sustain as an observe -> decide -> act toolset. Keep planning in the agent, not in the CLI.

CLI Preflight

Before using any sustain command:

1. Check whether deepsky sustain is already available.
2. If the command is missing or unusable, install the published CLI globally:

npm install -g @superise/deepsky-cli
deepsky sustain --help

3. If the install fails, report the exact npm error and stop instead of pretending the CLI is available.

Do not assume a local workspace checkout is already wired into PATH. The supported fallback is the published npm package.