Add comprehensive async test suite

[enaboapps]

Summary

• Add TestAsyncClient class with 10 async tests covering flush_async, flow_async, disconnect_async, and async context manager
• Tests use pytest-httpx for HTTP mocking
• Increases test count from 26 to 36

Closes #4

Test plan

• All 36 tests pass

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feature/async-tests-4

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