- Introduced dynamic testing capabilities, allowing for multi-turn conversations with checkpoints through the new `DynamicRunner`.
- Enhanced the `runSingleTest` method to support dynamic mode, including the execution of before/after scripts and detailed output for dynamic test results.
- Added new output methods in `output.go` for dynamic test start, turns, checkpoints, and results, improving console feedback during testing.
- Updated `DESIGN_V2.md` and `TODO_V2.md` to reflect the new dynamic mode features, including simulator configurations and checkpoint definitions.
- Revised the `Case` struct in `types.go` to include fields for dynamic testing, such as `Simulator`, `Checkpoints`, and `MaxTurns`.
