Error Propagation Implementation Plan - Summary

Timeline: 3-4 weeks (expanded from 2-3 weeks)

Key Features:
- Configurable syntax: Support all three options (?, !, try) via dingo.toml configuration
- Source maps: VLQ-based source mapping for .dingo error messages from day one
- Real-world validation: Comprehensive testing with Go stdlib (http, database/sql, os, io, json)
- Production-ready: Full type validation, error translation, documentation

Architecture Highlights:
- Unified AST with syntax-specific parsers (factory pattern)
- Source map integration using github.com/go-sourcemap/sourcemap library
- Configuration precedence: CLI flags > project config > user config > defaults
- Comprehensive testing: 80% unit, 15% integration (stdlib), 5% end-to-end

Next Steps: Review critical decisions (default syntax, source map format), spike source map library validation, begin Week 1 implementation
