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/mz/index.js

@@ -0,0 +1,8 @@
+module.exports = {
+  fs: require('./fs'),
+  dns: require('./dns'),
+  zlib: require('./zlib'),
+  crypto: require('./crypto'),
+  readline: require('./readline'),
+  child_process: require('./child_process')
+}