Hide old Agent UI when ACP flag set (#36533)

- **Use key value store instead of JSON**
- **Default NewThread to the native agent when flagged**

Closes #ISSUE

Release Notes:

- N/A *or* Added/Fixed/Improved ...
757b37fd41Conrad Irwin committed on 8/19/2025, 10:42:52 PM· committed by GitHubparentecee674
1 file changedLine totals unavailable