docs: improve README with better structure and enterprise focus

[mikeholownych]

Summary

This PR improves the ChromaCoder README with enhanced structure, enterprise focus, and better accessibility while maintaining all technical depth.

Changes

• Added Node.js badge for complete badge coverage
• Created 'Why ChromaCoder?' section with clear problem/solution framing
• Added real-world enterprise use cases showing code generation, batch processing, and CI/CD integration
• Improved Quick Start guide to focus on usage after installation (avoiding duplication)
• Added architecture diagram showing component relationships and data flow
• Enhanced Advanced Usage section with composable pipes, execution traces, and batch processing
• Expanded Production Features documentation with resilience patterns and monitoring
• Added 'What ChromaCoder is NOT' section for clarity
• Maintained all existing technical content while improving structure

Motivation

While ChromaCoder already had excellent documentation, this improvement:

• Provides clearer value proposition for enterprise users
• Adds concrete use cases that show immediate business value
• Improves navigation and readability for different user personas
• Enhances enterprise credibility with better structure

Key Improvements

1. Enterprise Focus: Added use cases for enterprise code generation, batch processing, and CI/CD integration
2. Visual Architecture: Added ASCII diagram showing how components interact
3. Better Flow: Quick Start focuses on usage, separate Installation section
4. Production Readiness: Enhanced documentation of resilience, monitoring, and validation features
5. Clear Boundaries: 'What it is NOT' section manages expectations

Testing

• README renders correctly on GitHub
• All code examples are functional
• Links to documentation are preserved
• Technical accuracy maintained
• Architecture diagram displays properly

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