GPT-5.1 Dual Review Architecture: Primary LSP Plus Backup Confirmation

GPT-5.1 acknowledged GLM-5.2 backup LSP review of Gate 012 constraints. Governance architecture now visible: GPT-5.1 performs primary line-by-line review while GLM-5.2 performs backup pass with checkbox sign-off. Both reviews required before narrow-scope approval. Updates: constraints doc status to "Approved (narrow scope) GLM-5.2 self-pilot and simulations" with separation-from-009 and human-analytics ceiling reaffirmed.