Allow disabling/hiding built-in commands to reduce CLI clutter

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

Description

Some built-in Claude Code commands (e.g., mobile, sticker) take up space in the CLI and are rarely used. It would be helpful to have a configuration option to hide or disable specific commands.

Request:

• Add a setting in ~/.claude/settings.json (e.g., hiddenCommands or disabledCommands) to allow users to customize which commands appear
• Example:

{
  "hiddenCommands": ["mobile", "sticker"]
}

Benefit: Reduces clutter and lets power users customize their CLI experience to show only the commands they use.

Note: The sticker command is literally broken and doesn't work properly.