A small door
Same shell door. Behind it now: worktrees, jobs, agents — and the same edge.
What you kept behind a terminal used to fit in a short file. Copy it to the next machine, lose the half you never wrote down, start again. Aliases, paths, that was the setup.
Now the same opening holds notes, worktrees, a job still running in the morning, and agents that can repeat the install, the move to the next laptop, and the check you used to do by hand. The door did not widen, but the room behind it did.
A shell was always the way into the whole computer. It can reach the file, the process, the image, the source, and the dump no button is offering. It will also run the command you did not mean. There is nothing under it to catch you.
An app for git, an app for launching, an app for each chore makes a different trade. It shows that job and puts the rest of the machine out of sight. It can watch you while it helps. That does not hand the computer back, it is a row of rooms that cannot see each other.
Agents do not wrap that edge. They share the list you used to hold alone. A bad instruction still lands on your computer.