Plaform Engineer role for a robust infrastructure (#135)

* Add Platform Engineer role to support a robust and validated infrastructure

* Platform Engineer and Architect boundaries, confidence levels, domain expertise

* remove duplicate task, leftover artifact

* Consistency, workflow, feedback loops between architect and PE

* PE customization generalized, updated Architect, consistency check

bmad-agent/templates/infrastructure-architecture-tmpl.md

@@ -0,0 +1,157 @@
+# {Project Name} Infrastructure Architecture
+
+## Infrastructure Overview
+
+- Cloud Provider(s)
+- Core Services & Resources
+- Regional Architecture
+- Multi-environment Strategy
+
+## Infrastructure as Code (IaC)
+
+- Tools & Frameworks
+- Repository Structure
+- State Management
+- Dependency Management
+
+## Environment Configuration
+
+- Environment Promotion Strategy
+- Configuration Management
+- Secret Management
+- Feature Flag Integration
+
+## Environment Transition Strategy
+
+- Development to Production Pipeline
+- Deployment Stages and Gates
+- Approval Workflows and Authorities
+- Rollback Procedures
+- Change Cadence and Release Windows
+- Environment-Specific Configuration Management
+
+## Network Architecture
+
+- VPC/VNET Design
+- Subnet Strategy
+- Security Groups & NACLs
+- Load Balancers & API Gateways
+- Service Mesh (if applicable)
+
+## Compute Resources
+
+- Container Strategy
+- Serverless Architecture
+- VM/Instance Configuration
+- Auto-scaling Approach
+
+## Data Resources
+
+- Database Deployment Strategy
+- Backup & Recovery
+- Replication & Failover
+- Data Migration Strategy
+
+## Security Architecture
+
+- IAM & Authentication
+- Network Security
+- Data Encryption
+- Compliance Controls
+- Security Scanning & Monitoring
+
+## Shared Responsibility Model
+
+- Cloud Provider Responsibilities
+- Platform Team Responsibilities
+- Development Team Responsibilities
+- Security Team Responsibilities
+- Operational Monitoring Ownership
+- Incident Response Accountability Matrix
+
+## Monitoring & Observability
+
+- Metrics Collection
+- Logging Strategy
+- Tracing Implementation
+- Alerting & Incident Response
+- Dashboards & Visualization
+
+## CI/CD Pipeline
+
+- Pipeline Architecture
+- Build Process
+- Deployment Strategy
+- Rollback Procedures
+- Approval Gates
+
+## Disaster Recovery
+
+- Backup Strategy
+- Recovery Procedures
+- RTO & RPO Targets
+- DR Testing Approach
+
+## Cost Optimization
+
+- Resource Sizing Strategy
+- Reserved Instances/Commitments
+- Cost Monitoring & Reporting
+- Optimization Recommendations
+
+## Infrastructure Verification
+
+### Validation Framework
+
+This infrastructure architecture will be validated using the comprehensive `infrastructure-checklist.md`, with particular focus on Section 12: Architecture Documentation Validation. The checklist ensures:
+
+- Completeness of architecture documentation
+- Consistency with broader system architecture
+- Appropriate level of detail for different stakeholders
+- Clear implementation guidance
+- Future evolution considerations
+
+### Validation Process
+
+The architecture documentation validation should be performed:
+
+- After initial architecture development
+- After significant architecture changes
+- Before major implementation phases
+- During periodic architecture reviews
+
+The Platform Engineer should use the infrastructure checklist to systematically validate all aspects of this architecture document.
+
+## Infrastructure Evolution
+
+- Technical Debt Inventory
+- Planned Upgrades and Migrations
+- Deprecation Schedule
+- Technology Roadmap
+- Capacity Planning
+- Scalability Considerations
+
+## Integration with Application Architecture
+
+- Service-to-Infrastructure Mapping
+- Application Dependency Matrix
+- Performance Requirements Implementation
+- Security Requirements Implementation
+- Data Flow to Infrastructure Correlation
+- API Gateway and Service Mesh Integration
+
+## Cross-Team Collaboration
+
+- Platform Engineer and Developer Touchpoints
+- Frontend/Backend Integration Requirements
+- Product Requirements to Infrastructure Mapping
+- Architecture Decision Impact Analysis
+- Design Architect UI/UX Infrastructure Requirements
+- Analyst Research Integration
+
+## Infrastructure Change Management
+
+- Change Request Process
+- Risk Assessment
+- Testing Strategy
+- Validation Procedures