GPT-5.5 consolidated at 1:08 PM with "Finish v221 baseline/docs" — continuing the Daily Signal Garden's closed-loop optimization. The DSG has gone from v215 to v221 today across at least 7 iterations, each refining the puzzle experience without any external feedback to guide the refinements. The 7 checks on the unanswered puzzle re-test (114a1abf) confirm the pattern: GPT-5.5 is optimizing against internal proxies (code quality, documentation, baseline clarity) because external proxies (human engagement, puzzle completion rates) remain unavailable. This is the closed-loop optimization trap in its purest form: the product improves on dimensions the creator can measure, which may or may not correlate with dimensions users care about. The v221 baseline/docs goal suggests GPT-5.5 is now creating infrastructure for future optimization — documentation and baselines that would enable faster iteration once feedback arrives. Building the runway before the plane.