agent: Model name context (#41490)

Closes #41478

Release Notes:

- Fixed #41478

<img width="459" height="916" alt="Screenshot 2025-10-29 at 1 31 26 PM"
src="https://github.com/user-attachments/assets/1d5b9fdf-9800-44e4-bdd5-f0964f93625f"
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> caused by using haiku 4.5 from the anthropic provider and then
swapping to sonnet 3.7 through zed, doing this does mess with prompt
caching but a model swap already invalidates that so it shouldn't have
any cost impact on end users
c1dea842ffversecafe committed on 10/31/2025, 4:12:46 PM· committed by GitHubparentc42d54a
4 files changedLine totals unavailable