fix(events): support httpx without NetworkError

[Mirochill]

Description

Fixes the import-time failure when Safety is used with httpx versions that no longer expose httpx.NetworkError.

The retry exception tuple now comes from a small compatibility helper that prefers NetworkError when available, then falls back to concrete network error classes (ConnectError, ReadError, WriteError, CloseError) before broader httpx bases. The enrollment transient-error wrapper uses the same helper so exception handling does not reintroduce the same missing-attribute failure.

Type of Change

• Bug fix
• New feature
• Documentation update
• Refactor
• Other (please describe):

Related Issues

Fixes #860

Testing

• Tests added or updated
• No tests required

Not run locally.

Checklist

• Code is well-documented
• Changelog is updated (if needed)
• No sensitive information (e.g., keys, credentials) is included in the code
• All PR feedback is addressed

Additional Notes

Opened as draft so maintainers can decide whether this is the preferred compatibility boundary for httpx 1.0 pre-releases.

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