- Create kb_pipeline package structure
- Add test fixtures in conftest.py
- Add 28 test cases for StepInput, StepOutput, StepStatus, StepRecord, WorkflowState
- Add JSON serialization/deserialization tests
- TDD RED phase: tests fail because schemas.py not yet implemented
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>