feat(html): add @choojs/html — server renderer, raw(), morph

ESM ports with attribution: nanohtml 1.10.0 server tag (browserify/babel
transform branches removed — pure runtime), raw-server, and nanomorph 5.4.3
consolidated into one module. browser.js is a Phase 2 placeholder that
throws loudly. Covered by test/server.test.js on node:test.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014NgfSjHE11oFpoSnLVKLXd

packages/html/browser.js

@@ -0,0 +1,15 @@
+// Phase 2 (rendering core) lands here: a runtime-only tagged template that
+// parses each template once (keyed by its strings array in a WeakMap) and
+// instantiates DOM by cloning. No compile step, ever.
+//
+// Until then, importing @choojs/html in a browser build fails loudly rather
+// than silently rendering nothing.
+
+export default function html () {
+  throw new Error(
+    '@choojs/html: the browser renderer is not implemented yet (v8 Phase 2). ' +
+    'Server-side rendering via the "node" condition works today.'
+  )
+}
+
+export { html }