AI software architecture design — modules, layers, boundaries, design patterns, ADRs, quality attributes, and technical debt strategy for AI-enabled systems. This skill should be used when the user asks to 'design AI system structure', 'define AI module boundaries', 'select AI architecture patterns', 'document AI architecture decisions', 'evaluate AI code architecture', or mentions AI pipelines, feature stores, model serving, drift detection, ML quality attributes, explainability architecture, or AI technical debt. [EXPLICIT]