docs(design): remove SVG, use PNG logo only

SVG icon is no longer in use. public/logo.png (1024x1024 RGBA) is
the single logo asset. DESIGN.md updated accordingly: SVG snippet
removed, wordmark pattern and <head> references updated to PNG.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

node_modules/postcss-js/index.js

@@ -0,0 +1,11 @@
+let async = require('./async')
+let objectify = require('./objectifier')
+let parse = require('./parser')
+let sync = require('./sync')
+
+module.exports = {
+  objectify,
+  parse,
+  async,
+  sync
+}