Problem

nemoclaw status and nemoclaw <name> status do very different things, but the CLI does not explain that model clearly enough. New users can easily confuse global service status with sandbox health status.

Scope

• Clarify the distinction in top-level help
• Add better remediation hints when users run the wrong form
• Consider whether command descriptions or output headers should make the hierarchy more explicit

Acceptance Criteria

• Top-level help explicitly explains global commands vs sandbox-targeted commands
• status output clearly identifies whether it is global or sandbox-scoped
• Wrong-form usage gives a concrete next step

Context

This came out of a CLI review against https://clig.dev/. The current command model is workable, but not taught clearly by the CLI itself.