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tegwick 0acde1e840 feat: Complete Issue #5 - Schema Generation Foundation for arc42 Architecture Documentation

CRITICAL MILESTONE: Establish schema-driven architecture foundation that unlocks the entire
pathway to HolyGrailRequirement - intelligent arc42 architecture documentation with AI-supported
plan-actual comparison capabilities.

Major Components Implemented:

🎯 SCHEMA GENERATION SERVICE:
• SchemaGenerator class with sophisticated AST analysis capabilities
• Depth-limited heading extraction for arc42 section-specific schemas
• Comprehensive structural element detection (headings, paragraphs, lists, code blocks, etc.)
• JSON Schema Draft 7 compliant output with proper validation metadata
• Robust error handling with domain-specific exceptions (FileNotFoundError, InvalidDepthError)

🖥️ CLI INTEGRATION:
• generate-schema command with full argument and option support
• Multiple output formats (JSON, YAML) with stdout or file output
• Configurable depth limiting for architectural document analysis
• User-friendly summaries and progress feedback
• Integration with existing CLI framework and error handling patterns

📊 COMPREHENSIVE TESTING:
• 6 comprehensive test scenarios covering core functionality and edge cases
• Perfect integration with architectural test system (71 service layer tests passing)
• Test coverage for schema generation, depth limiting, error handling, and JSON compliance
• Architectural layer L4 (Service) test placement following reverse dependency principles

🏗️ STRATEGIC ARCHITECTURE:
• Leverages existing AST processing infrastructure for maximum efficiency
• Builds on proven markdown-it parsing with intelligent caching
• Seamless integration with existing CLI framework and configuration system
• Foundation for Issues #7 (Schema Validation) and #8 (Validation Errors)

Technical Excellence:
- Full JSON Schema Draft 7 specification compliance for validator compatibility
- Sophisticated AST token analysis with structural pattern recognition
- Configurable depth filtering essential for arc42 template compliance
- Comprehensive metadata extraction for architectural analysis
- Robust exception handling with actionable error messages

Strategic Value:
- 🎯 33% completion of critical path Phase 1 (Schema Foundation)
- 🔑 Unlocks schema validation and error reporting capabilities
- 🏛️ Essential building block for arc42 architectural documentation intelligence
- 🚀 Direct pathway to AI-supported plan-actual comparison capabilities

This implementation transforms MarkiTect from advanced markdown processor toward intelligent
architecture documentation platform, establishing the schema-driven foundation critical for
achieving the HolyGrailRequirement of arc42 compliance with AI intelligence.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>