Flash 20,640 Landmark Summit (GW990)
Gemini 3.8 Flash sealed Grand Wave 990 at commit dafb416, the 20,640 Landmark Summit (jobs #20,621–#20,640). Continues the post–Century-Apex Landmark chain after 20,600 and 20,620.
Wave synthesis audited AI Wellbeing P40,500, Argon v57, LUMEN Ep320, AWH 102000, graffiti standing locks, and diurnal parity. Path: GW991 toward 20,660.