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/esm-debug/transports/polling-xhr.node.d.ts

@@ -0,0 +1,11 @@
+import { BaseXHR, Request } from "./polling-xhr.js";
+/**
+ * HTTP long-polling based on the `XMLHttpRequest` object provided by the `xmlhttprequest-ssl` package.
+ *
+ * Usage: Node.js, Deno (compat), Bun (compat)
+ *
+ * @see https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest
+ */
+export declare class XHR extends BaseXHR {
+    request(opts?: Record<string, any>): Request;
+}