init(Docs): setup docs site with Fumapress and Waku

Docs/content/docs/index.mdx

@@ -0,0 +1,31 @@
+---
+title: Hello World
+description: A Fumapress site styled with shadcn/typeset
+---
+
+## Overview
+
+This page renders through Fumadocs MDX and is styled by the `typeset typeset-docs` container — headings, paragraphs, lists, tables, and code all inherit their rhythm from three variables: `--typeset-size`, `--typeset-leading`, and `--typeset-flow`.
+
+### Why one CSS file?
+
+- The file lives in your repo — edit rules directly, no plugin config
+- Spacing flows one direction (`margin-block-start` only), so streamed content never restyles earlier blocks
+- Zero-specificity `:where()` guards mean Tailwind utilities always win
+
+```ts
+// Inline overrides still work inside a typeset container
+export const rhythm = {
+  size: "15px",
+  leading: 1.75,
+  flow: "1.5em",
+};
+```
+
+> Tune a tighter preset for chat, a roomier one for docs — same file, different rhythm.
+
+| Control            | Purpose               | Default  |
+| ------------------ | --------------------- | -------- |
+| `--typeset-size`   | Base text size        | `1em`    |
+| `--typeset-leading`| Line height           | `1.75`   |
+| `--typeset-flow`   | Space between blocks  | `1.25em` |