[HarrisJDCampbell]

Closes #231.

Add hello_sync_client.py to demonstrate calling the async client from synchronous code. greet() uses asyncio.run() to connect, execute a workflow, and return its result. A worker runs in the same process to keep the example standalone.

Create a new client for each call so it stays on the event loop that created it. Document that the wrapper requires a thread without a running event loop, and that applications making frequent calls should prefer a long-lived client and separate worker.

Add the sample to both README indexes and an integration test covering two consecutive calls.

Tested locally:

• Integration test with local and time-skipping environments
• Ruff lint, import order, and formatting
• Mypy
• git diff --check

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