- Add get_anomaly_attr() helper that handles both dict and object
anomalies. The SDK's send_message() returns dicts, so getattr()
was silently returning defaults -- critical blocking never triggered.
- Fix field name: "detail" -> "details" (matches SDK schema).
- Make fail-open/fail-closed configurable via INSAITS_FAIL_MODE env var
(defaults to "open" for backward compatibility).
- Include exception type name in fail-open log for diagnostics.
- Normalize severity comparison with .upper() for case-insensitive matching.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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