feat: Replace bash CLI with Node.js implementation and update package dependencies

feat: Add OpenAI stream conversion script and remove unused demo scripts

refactor: Organize and separate OpenAI API guards and converters for improved clarity and maintainability

refactor: Consolidate exports in harmony index file for clarity

feat: Implement Harmony response harmonization

feat: Implement Harmony to Responses API converter

refactor: Improve comments for testing incomplete FunctionTool and CodeInterpreter in system and developer message specs

refactor: Update test imports to use centralized fixtures support file

refactor: Improve type handling and validation in tests for message and tool processing

feat: Implement modular streaming markdown parser with block processing

refactor: Remove unused exports and clean up harmonizer module

feat: Add utility functions for chat parameter extraction and message formatting

Add comprehensive markdown samples and enhance streaming parser tests

Refactor Gemini Stream Handler to Functional Approach and Add Markdown Streaming Utilities

Refactor GeminiStreamHandler to use a state management approach with a reducer pattern