prd-v06-architecture-design

Define how system components connect, establishing boundaries, patterns, and integration approaches during PRD v0.6 Architecture. Triggers on requests to design architecture, create system design, define component relationships, or when a user asks "design architecture", "system design", "how do components connect?", "architecture decisions", "technical architecture", "system overview". Consumes TECH- (stack selections), RISK- (constraints/high-priority risks), FEA- (feature requirements). Outputs ARC- entries documenting architecture decisions with rationale. Feeds the v0.6 Technical Specification.