Ref T13490. Moves "arc amend" to Toolsets with modern ref/hardpoint code.
- Maniphest Tasks
- T13490: Upgrade all "classic" Arcanist workflows to Toolsets
- rARC0f2e277cd986: Update "arc amend" for Toolsets
Ran "arc amend --show", "--revision", etc. Hit all the prompts and errors, probably?