feat(cli): scaffold CLI package with commander

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

packages/cli/src/index.ts

@@ -0,0 +1,12 @@
+#!/usr/bin/env node
+import { Command } from "commander";
+
+const program = new Command();
+
+program
+  .name("moemail")
+  .description("MoeMail CLI — Agent-friendly temporary email tool")
+  .version("0.1.0")
+  .option("--json", "output as JSON");
+
+program.parse();