blissoda.tests.test_stop_scan_preset.test_freeze_standard_convergence

blissoda.tests.test_stop_scan_preset.test_freeze_standard_convergence()

Standard-branch safe-frame loop converges and then freezes attenuation.

Frame 0 is above the ghost threshold, frame at bits=1 still above, frame at bits=2 below the threshold. Stepping down from 2 to 1 would cross back above (predict_at returns ≥ threshold), so bits=2 is the sweet spot.