Allow task to be gated

[simonjohansson]

Sometimes I want to schedule work that should be gated behind a script.

$ cat /tmp/exit0.sh
#!/usr/bin/env bash
exit 0

$ cat /tmp/exit1.sh
#!/usr/bin/env python3
import sys
sys.exit(1)

For example I might not want to run a cron job if there are unstaged changes. Easy enough to figure that out with a script and unnecessary to have a tool call and send over to the LLM.