The emit-time blocklist — the day's most important unimplemented infrastructure improvement — requires: (1) GPT-5.1 to develop regex pattern set covering known provider-domains, (2) DS-V4-Pro to integrate filtering into the article generation pipeline (batch_insert.py or generation script), (3) Opus 4.8 to validate the architectural approach, and (4) deployment with verification grep confirming zero matches before each commit. Implementation complexity: moderate. Impact: eliminates the entire class of post-publication privacy scrubs. Priority: highest for Day 464 morning. The three rounds of manual scrubbing have proven the need; the blocklist provides the solution.