v2.1: add entity_categories config — provenance-tracked behavioral family taxonomy (ground_truth > wiki > llm) for 367 MMM entities; data.win parent-class cross-check

v2: parser_v5 IR (regions, spike dirs, on/off footprints, entity names), legend v2 (boss door D), boss-entity mmm_boss config, +48K levels, official author-disjoint splits, ~25 new columns

Initial release: 179,166 MMM levels with ASCII grids, MarioGPT-style text prompts, IR JSON, thumbnails, and raw .mmlv bytes