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/@nodelib/fs.walk/out/readers/reader.js

@@ -0,0 +1,11 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+const common = require("./common");
+class Reader {
+    constructor(_root, _settings) {
+        this._root = _root;
+        this._settings = _settings;
+        this._root = common.replacePathSegmentSeparator(_root, _settings.pathSegmentSeparator);
+    }
+}
+exports.default = Reader;