Add foundational documentation templates to support product design and architecture planning, including ADR, archetypes, LLM systems, dev setup, and shared modules.

docs/frontend/ui-ux-guidelines.md

@@ -11,6 +11,8 @@
 - `/docs/backend/payment-flow.md`
 ---
 
+> This guide reflects a **pipeline / human‑review** archetype. For chat‑first or generation tools, keep the same principles (clarity, accessibility, safe actions) but replace the concrete flows and terminology per `/docs/archetypes.md`.
+
 ## 1. Tone & Clarity
 - Professional and concise. Emphasize trust (audit log, reasoning traces, secure billing and webhooks).
 - Avoid jargon without tooltips; show why a decision was made (rule hit, similarity, LLM reasoning).