build: PaddedCell-style install.mjs + SDK-aligned packaging

install.mjs (--install/--build-only/--uninstall/--openclaw-profile-path),
tsconfig outDir dist/fabric, package.json openclaw file dep + main.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

node_modules/engine.io-client/build/cjs/browser-entrypoint.js

@@ -0,0 +1,4 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+const socket_js_1 = require("./socket.js");
+exports.default = (uri, opts) => new socket_js_1.Socket(uri, opts);