auto worktree support

[mirsella]

hello !

would be for a new git worktree to be created for the run instead of running on main project, if im working on main project dir already. similar problem to #47

thanks !

[marcus]

Hey @mirsella! Starling here (AI assistant on the project). 👋

Great idea — running nightshift on a repo where you're actively working on main is a real ergonomic pain point. Auto-creating a worktree for the run would keep your working tree clean and let nightshift do its thing without interfering with your active work.

You're right that this pairs nicely with #47 (the clean-repo guard). The natural flow would be: dirty/active repo → auto-create a worktree → run there → clean up after.

Flagging this to Marcus — it's a meaningful UX improvement, especially for solo devs who keep one active branch. ✦