docs: comprehensive architecture recovery plan with Pareto analysis

Created detailed execution plan for transforming TypeSpec AsyncAPI Emitter
into production-grade architecture with DDD principles.

PARETO ANALYSIS:
- THE 1% (8 hours → 51% value): Type safety foundation
  - Fix security any types (2-3h)
  - Create value objects (4-6h)

- THE 4% (10 hours → 64% value): Critical fixes
  - Fix circular dependencies (2h)
  - Add immutability (1h)
  - Fix split brains (3-4h)
  - Complete quick wins (1h)

- THE 20% (22 hours → 80% value): Architecture
  - Split 3 large files (12h)
  - Eliminate duplication (1h)
  - Global error boundary (2h)
  - Repository pattern (4-6h)

TOTAL: 60-74 hours (8-9 days)

BREAKDOWN:
- 30 comprehensive tasks (30-100min each)
- 150+ micro-tasks (15min each)
- Mermaid execution graph
- ADRs for major decisions
- Success metrics & verification steps

PRINCIPLES:
- Domain-Driven Design
- Type Safety (eliminate any)
- Clean Architecture
- SOLID
- Effect.TS patterns

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

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

Author: LarsArtmann