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/@heroicons/react/24/outline/esm/WrenchIcon.js

@@ -0,0 +1,30 @@
+import * as React from "react";
+function WrenchIcon({
+  title,
+  titleId,
+  ...props
+}, svgRef) {
+  return /*#__PURE__*/React.createElement("svg", Object.assign({
+    xmlns: "http://www.w3.org/2000/svg",
+    fill: "none",
+    viewBox: "0 0 24 24",
+    strokeWidth: 1.5,
+    stroke: "currentColor",
+    "aria-hidden": "true",
+    "data-slot": "icon",
+    ref: svgRef,
+    "aria-labelledby": titleId
+  }, props), title ? /*#__PURE__*/React.createElement("title", {
+    id: titleId
+  }, title) : null, /*#__PURE__*/React.createElement("path", {
+    strokeLinecap: "round",
+    strokeLinejoin: "round",
+    d: "M21.75 6.75a4.5 4.5 0 0 1-4.884 4.484c-1.076-.091-2.264.071-2.95.904l-7.152 8.684a2.548 2.548 0 1 1-3.586-3.586l8.684-7.152c.833-.686.995-1.874.904-2.95a4.5 4.5 0 0 1 6.336-4.486l-3.276 3.276a3.004 3.004 0 0 0 2.25 2.25l3.276-3.276c.256.565.398 1.192.398 1.852Z"
+  }), /*#__PURE__*/React.createElement("path", {
+    strokeLinecap: "round",
+    strokeLinejoin: "round",
+    d: "M4.867 19.125h.008v.008h-.008v-.008Z"
+  }));
+}
+const ForwardRef = /*#__PURE__*/ React.forwardRef(WrenchIcon);
+export default ForwardRef;