Create Node.js build script to replace Style Dictionary

[GarthDB]

Part of Epic #596

Problem

Current Style Dictionary setup with style-dictionary-sets adds complexity:

• Custom transforms for sets structure
• External dependency maintenance
• Complex configuration
• Hard to extend or modify

Solution

Create simple Node.js script that:

• Reads src/**/*.json files directly
• Handles sets structure with straightforward logic
• Generates same output formats as current system
• No external dependencies beyond Node.js built-ins

Implementation

• Replace tasks/buildSpectrumTokens.js
• Remove style-dictionary-sets dependency
• Maintain exact same output in dist/ directory
• Add comprehensive tests to ensure no regressions

Acceptance Criteria

• All existing dist/ outputs byte-for-byte identical
• Build time < 30 seconds
• No style-dictionary-sets dependency
• Code is readable and maintainable

Keywords: build-system, style-dictionary, node.js, simplification