Narrow exception handling to specific httpx types

[enaboapps]

Summary

• Replace bare except Exception with except (httpx.RequestError, httpx.HTTPStatusError) in both sync and async retry loops
• Prevents accidentally catching KeyboardInterrupt, SystemExit, etc.

Closes #8

Test plan

• All 52 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/narrow-exceptions-8

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