Ref T13490. The new Arcanist runtime supports workflow signal handling, but Phage isn't quite able to make use of it. Clean up the last few pieces so it can work.
- Maniphest Tasks
- T13490: Upgrade all "classic" Arcanist workflows to Toolsets
- rARC33dc2fe8194d: Allow "phage" to print execution status on SIGINT
Ran "phage", hit ^C, got status information.