feat: bootstrap design kit and vaporwave demo baseline

AGENTS.md

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+# UI Design Code — Agent Instructions
+
+Read and follow `bible/README.md` as the architecture source of truth.
+
+This repository is a submodule-first design kit for Go web projects. Keep shared assets in
+`kit/` generic and reusable; project branding belongs in host repositories.
+
+## Rules
+
+- Architecture and integration contracts live in `bible/` (English only).
+- Significant decisions go to `bible/decisions/10-decisions.md`.
+- Public bundle contracts live in `exports/`; keep them in sync with `kit/`.
+- Prefer updating shared templates/patterns over adding host-specific logic here.
+- Do not broaden the repository scope beyond the currently approved area unless the user
+  explicitly requests it; when in doubt, stay focused on the current scope.