Feature Request: Include old_string and new_string in edit tool hook events

[jxtin]

Context

Building an audit tool for pi-agent. The edit tool hook only sends path, missing old_string and new_string.

Current

{path: file.txt}

Request

Would be great if edit tool also sent old_string and new_string like the write tool sends content. This would let extensions track lines added/removed.

Question

Is there a reason for the current design? Would a PR be welcome?