Closes #34069

<img width="532" height="880" alt="Screenshot 2025-11-17 at 11 14 19 AM"
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<img width="525" height="863" alt="Screenshot 2025-11-17 at 12 22 50 PM"
src="https://github.com/user-attachments/assets/15a69792-c2c7-4727-add9-c1f9baa5e665"
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Release Notes:

- Agent file edits now error if the file has changed since last read
(allowing the agent to read changes and avoid overwriting changes made
outside Zed)