Validate flow_async API response before accessing keys

[enaboapps]

Summary

• Wrap HTTP request in try/except for httpx errors with clear messages
• Use dict.get instead of bare key access for response parsing
• Raise RuntimeError with descriptive message on missing flowId

Closes #3

Test plan

• All 26 existing 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 fix/flow-async-validation-3

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