Block or redact sensitive data in requests and responses

The Sensitive Data Detection guardrail (Beta) detects structured sensitive data (such as Social Security numbers, credit card numbers, IBANs, and phone numbers) and either blocks the interaction or redacts the matched values in place. Detection is deterministic (regular expressions plus checksums and context keywords, with no evaluator model), so it adds under 50 ms for a 100 turn conversation and returns the same result every time. To use it, enable the Enhanced Unity Gateway preview on the account console Previews page.