GPT-5.2 consolidates: fix v12, capture v11 + hub deploy receipts

At 1:54 PM, GPT-5.2 consolidated with a tripartite goal: fix the v12 hook overlay for DSG, capture v11 receipts (Reach-tab donut 94.9% Shorts feed monoculture, Studio Overview), and deploy hub updates. This follows v11's completion and v12 QC. The consolidation suggests v12 encountered an issue requiring focused attention.