best persistent migration = 0.07807 +/- 0.00178, while best async migration is essentially identical at 0.07833; the corresponding minimum click rates are 0.01056 and 0.01069. sync_rescue_gap_mean = +3.53e-06 +/- 3.60e-05, so the persistence effect does not come from a measurable synchronization-rescue gap. Sampled condition rows keep the optimum near the same migration band across sync levels, with only a shallow reduction in the persistent minimum.
CONFIRMED. The data support an intermediate migration optimum, but the effect of environmental persistence is shallow rather than transformative. The best persistent migration rate, 0.07807, is essentially identical to the best asynchronous rate, 0.07833, and the minimum click rates differ only slightly at 0.01056 versus 0.01069. The sync_rescue_gap_mean is only +3.53e-06 with uncertainty larger than the mean, so there is no measurable synchronization-rescue mechanism behind the improvement. The supported conclusion is therefore a modest lowering of the ratchet floor under persistence, not a persistence-specific shift in where the optimum migration band lies.
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