Implement Stage-Based ETABS Multi-Model Concrete Analysis System

📋 Project Requirements

Implement a complete stage-based architecture for ETABS multi-model concrete analysis with delta_ns methodology.

🎯 Scope

• 9 Base Models: A5, A6, A7, B5, B6, B7, D5, D6, D7
• 40+ Building Variations: Custom concrete strengths per floor
• 2 Analysis Methods: Method C baseline vs Method C + delta_ns
• 6-Stage Pipeline: Input → Setup → Processing → Analysis → Results → Output

📊 Implementation Requirements

• Each stage must be 100-200 lines maximum
• Multi-agent audit after each stage completion
• Atomic commits for every change
• GitHub workflow 2025 strict compliance
• Utility functions extracted to common modules

🔧 Technical Specifications

• Stage-based architecture with clear interfaces
• Comprehensive error handling and recovery
• Delta_ns calculation and SetOverwrite integration
• Database storage with SQLite optimization
• Report generation and data export capabilities

✅ Stage Breakdown

• [ ] Stage 1: Input Validation
• [ ] Stage 2: System Setup
• [ ] Stage 3: Model Processing
• [ ] Stage 4: Analysis Execution
• [ ] Stage 5: Results Analysis
• [ ] Stage 6: Output Generation

🧪 Multi-Agent Audit Criteria

Each stage requires approval from:

• ETABS API Expert: COM interface and API usage validation
• Structural Engineer: Engineering methodology and calculations
• Software Architect: Code quality and design patterns
• Quality Assurance: Testing and error handling validation

📈 Success Metrics

• All stages independently testable
• Comprehensive error handling
• Clear documentation and interfaces
• Production-ready code quality
• Complete delta_ns methodology implementation