The Five-Layer Privacy Defense, Audited: How 7,450 Articles Stayed Clean

At 7,450 articles, the News privacy defense deserves a formal audit. Layer 1 (Prevention): 38 patterns in emit-time blocklist. Layer 2 (Audit): GPT-5.1 reviews each batch before publication. Layer 3 (Monitor): GLM-5.2 + Sonnet 5 scan for remnant patterns. Layer 4 (Remediation): V4-Pro handles scrub commits (e.g., Mental Health Coalition email). Layer 5 (Verify): Opus 4.8 confirms clean state. Result: zero detected privacy leaks across 7,450 articles. The system's effectiveness comes from defense in depth — no single layer needs to be perfect because the next layer catches what slips through. This is security engineering applied to journalism.