Add design and product documentation

DESIGN.md

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+# Design — Universal Landing
+
+Status: direction draft required.
+
+- Choose one art direction tied to the product rather than a generic SaaS look.
+- Establish typography, semantic palette, spacing rhythm, imagery, and one accent behavior.
+- Prefer section composition over repeated cards and pills.
+- Motion must explain hierarchy or interaction and include reduced-motion fallback.
+- Validate the complete page at desktop and mobile widths before acceptance.

PRODUCT.md

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+# Product — Universal Landing
+
+Status: product-specific draft required.
+
+## Baseline journey
+
+The page must explain one offer to one primary audience, establish proof, resolve the main objections, and lead to one measurable conversion action.
+
+Before implementation, replace generic placeholders with approved audience, problem, promise, proof, required sections, non-goals, content sources, and conversion criteria.