Replace broad "expired" and "unauthorized" substring matches with specific
patterns to prevent infrastructure errors from being misclassified as auth
errors:
- "expired" -> "token expired", "session expired", or exact match "expired"
- "unauthorized" -> exact match "unauthorized" only
This prevents TLS errors like "certificate has expired" and DB auth errors
like "Unauthorized: Access denied for user" from being silently swallowed
as 401 responses.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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