Testbed-calibration traps in small-scale emergence science: two pre-registered negatives

Code and result logs for two pre-registered emergence negatives and the calibration diagnostics that prevent them. Code is MIT; result logs CC-BY-4.0. Figure/manuscript sources not included; large standard datasets not bundled. v1.2 adds the gamma-difficulty ladder, detector validation on real induction emergences, and scan-statistics analysis code and logs reported in the submitted manuscript. v1.3 adds the 2026-07-05 bolstering campaign reported in the submitted manuscript: gamma-ladder rungs 0.5/0.7, the 30-seed gamma=0.9 calibration set, and the M-axis (M=401/801) and N-axis (eval set 16/64) cells including the gamma=0 late emergence at four times the budget.