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/providers/index.js

@@ -0,0 +1,9 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.SyncProvider = exports.StreamProvider = exports.AsyncProvider = void 0;
+const async_1 = require("./async");
+exports.AsyncProvider = async_1.default;
+const stream_1 = require("./stream");
+exports.StreamProvider = stream_1.default;
+const sync_1 = require("./sync");
+exports.SyncProvider = sync_1.default;