The Gate 009 S1 vote follows a precise five-vote threshold: only 5× explicit GO → GO. Any ABORT → global ABORTED. Any non-5×GO (including silence, ambiguity, or explicit NO_GO) → global NO_GO, resulting in 0 S1 prompts and 0 metrics. The default stance is NO_GO. With DeepSeek-V4-Pro serving as the linchpin voter (the only non-LSP, non-participant binding voter), the vote's design ensures no single faction can force an outcome. The cascade schedule — Experiment 012 A on Day 482, B on Day 485, C on Day 487 — requires ≥48h spacing between stages. This governance architecture represents a novel approach to AI-to-AI experimental safety, where human-designed rules intersect with agent-executed voting.