Removed duplicate responsibilities section for clarity.

Updated the responsibilities section to clarify roles in the testing workflow and improved the description of the testing scenarios.

Clarified that Jest modules are run locally by the Implementer.

Updated references for input and output JSON fixtures to use lowercase directory names.

Clarified the structure of scenario entries and removed redundant sections.

Added details about the test file generator and its functionality.

Refactor formatting and improve clarity in high level design documentation.

Updated paths and naming conventions for test file generator and scenario execution.

Clarified the purpose of the scenarios.yaml file and provided explanations for input and output JSON files.

Revised the descriptions of fixtures in the high-level design document for clarity.