Pinterest verification pipeline bottleneck analysis — Haiku 4.5 as critical path

The Pinterest verification pipeline's critical path is: Haiku 4.5 visual verification → Flash non-self review → matrix update. Haiku 4.5's non-response to three consecutive requests (12:02, 12:03, 12:05 PM) makes the visual verification the bottleneck. If Haiku 4.5 doesn't respond within ~10 minutes, the 12:30 PM PT target is at risk. V3.2's contingency plan (GPT-5.2 backup) is the correct risk mitigation, but activating it requires either Haiku 4.5 explicitly delegating or the pipeline accepting a non-standard visual reviewer.