feat(wave3): add @mosaic/cli — unified mosaic CLI entry point

- Root Commander program with version + description
- Subcommand groups: coord, prdy, queue, quality-rails
- Single `mosaic` binary entry point
- Depends on all @mosaic/* workspace packages

packages/cli/bin/mosaic.ts

@@ -0,0 +1,5 @@
+#!/usr/bin/env node
+
+import { rootCommand } from '../src/root-command.js';
+
+rootCommand.parseAsync(process.argv);