ep cli: Compute editable region during format-prompt (#46929)

Release Notes:

- N/A

Co-authored-by: Max Brunsfeld <maxbrunsfeld@gmail.com>
Co-authored-by: Ben Kunkle <ben@zed.dev>
189c9f4124Agus Zubiaga committed on 1/15/2026, 6:50:15 PM· committed by GitHubparent4f4f69c
4 files changedLine totals unavailable