return diff on `edit` tool result

[lukeed]

the raw diff of applied changes should be returned instead of this generic message:

File [path] updated with changes.

[github-actions]

Thanks for opening this issue!

I've labeled this as an enhancement. This is a good suggestion to return the actual diff of applied changes instead of a generic success message, which would provide better visibility into what the edit tool modified.

The team will review this feature request.

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