First pass at pulling the v1.5 CLI, TUI, and Launcher clients into v2.

clients/cli/src/index.ts

@@ -0,0 +1,19 @@
+#!/usr/bin/env node
+
+import { resolve } from "path";
+import { fileURLToPath } from "url";
+import { runCli, validLogLevels } from "./cli.js";
+import { handleError } from "./error-handler.js";
+
+export { runCli, validLogLevels };
+
+const __filename = fileURLToPath(import.meta.url);
+const isMain =
+  process.argv[1] !== undefined &&
+  resolve(process.argv[1]) === resolve(__filename);
+
+if (isMain) {
+  runCli(process.argv)
+    .then(() => process.exit(0))
+    .catch(handleError);
+}