Sum Types Phase 2.5 - Final Implementation Plan Summary
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SCOPE (Based on User Decisions):
- Fix position information bug + pattern destructuring (PARALLEL)
- Implement match expression IIFE wrapping (NOW, not Phase 3)
- Add configurable nil safety with 3 modes (off/on/debug)
- Design and implement configuration system (dingo.toml support)
- Address all 10 IMPORTANT code review issues
- Create comprehensive end-to-end tests

KEY DELIVERABLES:
1. New pkg/config/ package for configuration loading (TOML)
2. IIFE wrapping for match expressions in expression contexts
3. Pattern destructuring with configurable nil checks
4. Example dingo.toml.example with all settings
5. 5 new e2e tests demonstrating all features

TIMELINE: 3-4 days (28-32 hours)
- Day 1: Config system + position bug fix + start destructuring
- Day 2: Complete destructuring + IIFE wrapping
- Day 3: Address remaining IMPORTANT issues
- Day 4: E2E verification + polish + merge prep

ESTIMATED EFFORT BY COMPONENT:
- Configuration system: 3-4 hours (NEW)
- Position information fix: 2-3 hours (PARALLEL)
- Pattern destructuring: 4-6 hours (PARALLEL)
- IIFE wrapping: 4-6 hours (NEW)
- Remaining issues: 6-8 hours
- E2E verification: 4-6 hours

TOTAL: 23-33 hours (average 28 hours = 3.5 days)
