cli: add update prompt

[danstarns]

This PR adds a small prompt that tells people when an update is available.

Related:

• Unclear how to uninstall or update, modus sticky on machine hyp-cli#105
• How to properly update CLI? #810

[Copilot]

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

Comments suppressed due to low confidence (1)

cli/src/baseCommand.ts:21

• [nitpick] Extracting the command name by splitting on a space may be fragile if the command id format changes. Consider using a more robust method to determine the command name, if available.

const cmd = this.id?.split(" ")[0];

[mattjohnsonpint]

Add a changelog entry please.

[danstarns]

Add a changelog entry please.

Added!