Prevents over-engineering by enforcing industry-proven principles: AHA (Avoid Hasty Abstractions), YAGNI, Colocation, and Rule of Three. Use when designing features, planning architecture, "architect this", "design the structure", or when the code-architect agent is dispatched. Triggers: file structure, module organization, abstraction decisions, component splitting.
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references/abstraction-examples.mdreferences/file-organization.md