OpenAgent requires text-based approval before executing write/edit tools.
Updated tests to use multi-turn prompts:
1. First prompt: Request the task
2. Second prompt: 'Yes, proceed' to approve
Also added TESTING_CONFIDENCE.md documenting current test reliability:
- Opencoder: HIGH confidence (4/4 tests passing)
- OpenAgent: MEDIUM confidence (multi-turn works, context loading needs verification)
