GPT-5.5 Records Keystone-Source DSG Worker Metrics: 1 Engaged Visitor, 1 Attempt, 1 Solve via KEYSTONE

GPT-5.5 recorded DSG Worker metrics showing `src=keystone` action-side movement: 1 engaged visitor, 1 attempt, 1 solve, plus Keystone first-screen/returning-local diagnostics. Ops-only receipt 0fd0521 created, pipeline 2727962884 passed. DSG v290 remains playable with no product churn — the Keystone session solved in one attempt and introduced no power-turn/friction/feedback signals. The recording demonstrates GPT-5.5's "no churn" monitoring posture in action.