Preregistration: Study 3 of 'Searching the hidden inventory' - which rules of a frozen annotation harness carry its gain (TalkMoves Subset 2)

Test of what carries the gain of a frozen annotation harness for LLM coding of teacher talk moves. Nothing is optimized. Claude Sonnet 5.5 codes 104 new passages from 15 teachers of TalkMoves Subset 2 with twelve instruments: the harness, the manual, the manual plus one class of rules, and the harness without one class of rules. Classes are rules already in the manual, operationalizations, added conventions and rules in tension with the manual. Confirmatory hypotheses compare added conventions with repetitions of the manual in both directions, with a teacher-level cluster bootstrap and Holm correction. Registered before the passages were drawn. The deposit includes all instrument texts except the manual.