ep: Minor changes to evaluate context retrieval (#58572)

- Track average size of the retrieved context
- Support comma-separated values for `ep context --type`
- Exclude oracle from `editable` preset


Release Notes:

- N/A
d1271beee7Oleksiy Syvokon committed on 6/4/2026, 6:22:46 PM· committed by GitHubparentb53b14d
6 files changedLine totals unavailable