feat: Complete requirements engineering and strategic planning

Requirements Engineering Process:
- Validated architectural foundations (7 domain models, 6 interfaces)
- Generated development checklists for all three strategic epics
- Applied systematic requirements methodology

Epic Decomposition:
- Epic #64: Template & Calculation Engine (Issues #64-71) - 7 issues created
- Epic #65: Batch Processing & Workflows (Issue #72) - Epic created, 7 components planned
- Epic #66: External Systems & Professional Export (Issue #73) - Epic created, 7 components planned

Total Implementation Plan:
- 21 implementable issues across 3 strategic phases
- 24-week timeline for complete business platform transformation
- Clear dependencies and integration points identified

Key Achievements:
- Systematic decomposition from business requirements to implementable issues
- Comprehensive risk mitigation and quality assurance framework
- Architecture integration preserving backward compatibility
- Performance and scalability requirements defined

Ready for TDD8 implementation starting with Epic #64.

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

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

EPIC_66_EXTERNAL_INTEGRATION.md

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+# Epic #66: External Systems & Professional Export
+
+**Priority**: Medium - Enhances business system integration
+**Phase**: 3 (Integration & Professional Output)
+**Epic Owner**: Requirements Engineering Agent
+**Created**: 2025-10-02
+
+## Epic Overview
+
+Complete MarkiTect's transformation into a comprehensive business document platform through external system integration and professional output capabilities. Enable seamless integration with existing business systems and production of professional-quality documents.
+
+## Business Value
+
+- **ERP Integration**: Connect with business systems for automated data flow
+- **Professional Output**: Generate PDFs, DOCX, and styled documents for business use
+- **Document Relationships**: Manage complex document hierarchies and dependencies
+- **Compliance Support**: Enable audit trails and regulatory compliance workflows
+
+## Key Components (7 Issues)
+
+1. **External Data Connectors** - Database, API, file system integration
+2. **Professional Export Engine** - PDF, DOCX, HTML with styling
+3. **Document Relationship System** - Cross-document references and validation
+4. **Professional Template System** - Styled templates with corporate branding
+5. **Security & Access Control** - Enterprise-grade security for integrations
+6. **Audit & Compliance Framework** - Document lifecycle tracking
+7. **Integration Testing & Documentation** - Comprehensive integration validation
+
+## Success Criteria
+- Export styled PDF reports with CRM data integration
+- Validate cross-document references automatically
+- Support enterprise authentication and authorization
+- Enable audit trails for regulatory compliance
+
+See detailed breakdown in full specification document.