Addresses the need for a comprehensive contributing guide by creating a detailed CONTRIBUTING.md file that covers all aspects of contributing to the Fractalic AI workflow system.

What This PR Adds

Comprehensive Development Setup

• Multiple setup methods: core Python development, full stack with UI, and Docker-based development
• Clear installation instructions for different contribution types
• Validation commands to verify setup works correctly

Project Structure Documentation

• Detailed breakdown of the codebase architecture (core/, tests/, docs/, publisher/, etc.)
• Specific guidance on where different types of contributions should be made
• Clear explanation of key directories and their purposes

Testing Framework Coverage

• Documentation of Fractalic's unique testing approach using .md files as tests
• Python unit testing with pytest
• Integration and end-to-end testing procedures
• Publisher/deployment system testing

Multiple Contribution Pathways

• Core interpreter and operations development
• LLM provider integrations
• MCP (Model Context Protocol) tool development
• Documentation and examples
• Deployment and infrastructure improvements

Professional Development Practices

• Code style guidelines using Black, flake8, and mypy
• Commit message conventions and PR templates
• Issue reporting guidelines with clear templates
• Review process and community standards

Integration with Existing Standards

This guide properly integrates with the project's existing documentation ecosystem:

• References the established documentation authoring guidelines (.github/instructions/docs.instructions.md)
• Links to the existing Code of Conduct
• Maintains consistency with project tone and markdown style
• Uses the same structured approach as other project documentation

Validation

The guide has been validated against the actual project structure:

• All CLI commands and installation methods have been tested
• Directory structure matches the documented layout
• Links to community resources (Discord, documentation) are accurate
• Configuration files and scripts exist as described

This comprehensive guide provides clear pathways for contributors at all levels, from first-time contributors submitting documentation fixes to experienced developers adding new core features or deployment platforms.

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