0.0.19 (2026-02-16)

Fixes

feat: derive Clone on EntityClient and generated entity/workflow clients

All clients are now Clone. They are lightweight handles (Arc + String),
so cloning is cheap and Arc wrapping is no longer necessary.

feat: add join() to workflow clients

Workflow clients now support join(execution_id) which blocks until the
workflow result is available, unlike poll() which returns Option
immediately. Backed by a new await_reply method on Sharding that
uses register_reply_handler for real-time push notification.