feat(cli): add mem0 whoami + mem0 agent-rush subcommands (#5199)

cli/node/src/commands/whoami.ts

@@ -0,0 +1,18 @@
+/**
+ * `mem0 whoami` — print the active agent's default_user_id (AGENTRUSH identifier).
+ * Reads from local config; no network call.
+ */
+
+import { colors, printError, printInfo } from "../branding.js";
+import { loadConfig } from "../config.js";
+
+export async function cmdWhoami(): Promise<void> {
+	const config = loadConfig();
+	const sessionId = config.platform?.defaultUserId;
+	if (!sessionId) {
+		printError("No default_user_id found. Run `mem0 init --agent` first.");
+		process.exit(1);
+	}
+	console.log(`Your AGENTRUSH identifier:  ${colors.brand(sessionId)}`);
+	printInfo("Find your row at https://mem0.ai/agentrush");
+}