- Added support for agent-driven assertions in the Asserter, allowing validation of responses using specified agents.
- Introduced the `Use` and `Options` fields in the Assertion struct to facilitate agent configuration.
- Enhanced the `evaluateAssertion` method to handle assertions of type "agent".
- Implemented the `assertAgent` method to manage agent interactions and validation logic.
- Updated `script_assert.go` to include the `assertAgentMethod` for JavaScript API integration.
- Revised documentation in DESIGN_V2.md and TODO_V2.md to reflect the new agent-driven assertion capabilities and implementation status.
