feat: implement app-side telemetry sender

Add the shared telemetry sender, wire the CLI/server emit points,
and cover the config and completion behavior with tests.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

cli/src/version.ts

@@ -0,0 +1,10 @@
+import { createRequire } from "node:module";
+
+type PackageJson = {
+  version?: string;
+};
+
+const require = createRequire(import.meta.url);
+const pkg = require("../package.json") as PackageJson;
+
+export const cliVersion = pkg.version ?? "0.0.0";