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/jiti/bin/jiti.js

@@ -0,0 +1,16 @@
+#!/usr/bin/env node
+
+const { resolve } = require("node:path");
+
+const script = process.argv.splice(2, 1)[0];
+
+if (!script) {
+   
+  console.error("Usage: jiti <path> [...arguments]");
+  process.exit(1);
+}
+
+const pwd = process.cwd();
+const jiti = require("..")(pwd);
+const resolved = (process.argv[1] = jiti.resolve(resolve(pwd, script)));
+jiti(resolved);