CLI help text improvement

[xc93]

Firstly, read the Slack discussion (https://fast-ws.slack.com/archives/C0AGZ52BVM3/p1776056664140459) for full context.

Use the optimized skill (#74) as a reference and ask CC to improve the help text of the CLI. Skill can also be updated with general good practices and useful context, but not detailed information about subcommands.

References:

• Skill optimizer: https://github.com/fastxyz/skill-optimizer, developed by David and Ovidiu.