Tool replacement/management robustness

[fu5ha]

Summary

Right now, when /reloading a session with the apply_patch tool active and the standard edit and write tools already removed, the tool management/replacement logic thinks that there's no editor write or apply_patch tool and then doesn't add the apply_patch tool back.

For simplicity of logic, this PR takes the stance that if a user doesn't want any edit tools they should deactivate this extension:

The new logic is, if this extension is active, it will always add apply_patch when GPT-family model is active, and will remove apply_patch and add standard edit and write tools when GPT-family model is not active.

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[cubic-dev-ai]

No issues found across 2 files