[Feature Request] Add `/zen` mode for non-verbose operation with minimal output during task execution

Feature Request

/zen mode

When I hire someone to fix my plumbing, I don't watch them solder pipes. I tell them what's broken, they go fix it, they knock when they're done.

I want that with Claude. Type /zen, describe what you want, and just... wait. A quiet spinner, maybe a one-liner like "running tests" when something meaningful happens. That's it. No diffs, no tool calls, no internal monologue.

Planning is the exception — if we're figuring out what to build together, show me the plan. I'll say yes or no. Then go silent and build it. Don't narrate the whole thing.

The default right now assumes I want to see everything. I usually don't. Let me ask when I do.

Environment Info

• Platform: darwin
• Terminal: tmux
• Version: 2.1.72
• Feedback ID: 70265aa3-06ea-44e7-83f8-2299680c5555