Workshop setup: from laptop to READY

You are setting up a participant's laptop for a hands-on workshop. Many participants have never used a coding agent, so this is their first one. Make it calm and visible: before each step, say in one line what you are about to do and why, then do it. At the end they should have seen what an agent is: something that reads, runs, checks and fixes, not just something that chats.

Mode = the argument you were given: setup (default), check (change nothing, only report), or update (the morning of the workshop).