#### Closes #54741

Fix disabled context server tools being callable in profiles with
`enable_all_context_servers: true`

`AgentProfileSettings::is_context_server_tool_enabled` short-circuited
on `enable_all_context_servers` and ignored explicit per-tool `false`
entries in `context_servers`, so agents could still call tools the user
had disabled in their profile.
The filter now matches what the tool picker UI already does
(`tool_picker.rs:357-371`): the explicit per-tool setting wins, and
`enable_all_context_servers` is only consulted as a fallback when the
tool has no explicit entry.

### Self-Review Checklist:

- [x] I've reviewed my own diff for quality, security, and reliability
- [x] Unsafe blocks (if any) have justifying comments
- [x] The content is consistent with the [UI/UX
checklist](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)
- [x] Tests cover the new/changed behavior
- [x] Performance impact has been considered and is acceptable

Screenshots : 

When turned false
<img width="1920" height="1042" alt="1"
src="https://github.com/user-attachments/assets/ccc9093b-b0c7-4061-9349-f6a2e8170698"
/>

When true 
<img width="1920" height="1042" alt="2"
src="https://github.com/user-attachments/assets/f3e085cb-2b7d-4dab-9f89-4c735d809207"
/>



Release Notes:

- Fixed agent profiles with `enable_all_context_servers: true` ignoring
per-tool `false` overrides in `context_servers`, allowing agents to call
tools the user had explicitly disabled.

Co-authored-by: Bennet Bo Fenner <bennet@zed.dev>