feat: comprehensive ADR-structured design document template
Created production-ready design document template with 14 comprehensive sections:
**Structure:**
1. Executive Summary & Context
2. Requirements (Functional & Non-Functional)
3. Options Considered (with pros/cons/cost analysis)
4. Decision & Rationale (trade-offs, assumptions, review triggers)
5. Architecture (diagrams, components, data models, API contracts)
6. Implementation Plan (phases, dependencies, resources)
7. Risks & Mitigations (threat model, compliance)
8. Testing Strategy (unit, integration, e2e, performance)
9. Monitoring & Observability (metrics, alerts, dashboards)
10. Documentation & Training
11. Rollout Plan (feature flags, staged rollout, rollback)
12. Future Enhancements & Technical Debt
13. Acceptance Criteria
14. Appendices (research, meeting notes, changelog)
**Features:**
- Industry-standard ADR format
- Comprehensive examples throughout
- SQL schema examples
- API contract specifications
- ASCII architecture diagrams
- Risk matrices and threat models
- Rollout and rollback procedures
- META tokens for AI placeholder replacement
This template guides teams through complete technical design documentation
from problem statement to production rollout.
Addresses PROGRESS.md Stage 3 requirement: "Enhanced template with ADR structure"
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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