feat: product-engineer comprehensive todo.txt roadmap

- Transform todo.txt into world-class product roadmap
- Add clear product vision and success metrics
- Implement phased roadmap with 5 clear phases
- Fix duplicate task IDs and priority conflicts
- Add business value and impact for each task
- Include KPIs and success tracking methodology

Product Engineering Improvements:
- Clear Product Vision: Most reliable, user-friendly testing framework
- Success Metrics: < 30s execution, 99.9% reliability, 95% satisfaction
- Business Impact: 50% faster debugging, reduced support burden
- Phased Roadmap: Foundation → UX → Advanced → Validation → Coverage
- Product Value Framework: P1 Critical, P2 High, P3 Medium priorities

Key Fixes:
- Eliminated duplicate TASK-007 and TASK-008 conflicts
- Consistent priority system aligned with product value
- Clear dependencies and success criteria
- Business value and impact for each task
- Success tracking with KPIs and methodology

Result: World-class product roadmap ready for execution

Author: Rick