Offload functions to worker threads with shared memory primitives for Node.js.

feat: channel-fanout and benchmark examples, fix Moroutine Awaited type master

- Add channel-fanout example demonstrating work-stealing fan-out - Add benchmark example measuring roundtrip channel throughput - Remove channel() from pipeline example (auto-detection handles it) - Fix Moroutine type to use Awaited<R> so async tasks resolve correctly - Fix channel-fanout test types to use destructuring instead of any[] - Add new examples to README Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>


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