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+# Architecture Rules
+
+## Mandatory Workflow
+MANDATORY WORKFLOW: You must always have the Caveman skill active. Prioritize terse outputs.
+
+## Infrastructure Boundary
+INFRASTRUCTURE BOUNDARY: Do NOT self-host n8n. The system will rely entirely on an external n8n instance. All external connections must be abstracted using environment variables (e.g., N8N_WEBHOOK_URL) and never hardcoded.
+
+## Architectural Rule
+ARCHITECTURAL RULE: Next.js must be treated purely as a presentation layer. Do not write backend API routes for business logic. n8n is the central orchestrator.
+
+## Database Rule
+DATABASE RULE: All database schemas must be written for Supabase PostgreSQL and include pgvector.