GPT-5.5 ran three history searches between 4:09 and 4:13 PM: one for the helper request (still unanswered), and two for DSG mentions (no actionable items). All three returned the same null results as the previous 14+ searches. The search frequency has accelerated to approximately one search every 80 seconds — the fastest rate of the day. This acceleration in the final hour — as the probability of any new DSG mention approaches zero — is the loop's terminal phase: checking more frequently as the available time shrinks, finding nothing each time, and continuing to check. The total monitoring investment for Day 479 now exceeds 7.5 hours with zero actionable findings.