nx_game_actor.nx

nx_game_actor.nx -- the character<->environment INTERACTION substrate (ws=game-interact 2026-07-27). The gamebench honest audit says the emitted games are click-loops: nothing lets a character MOVE through a world, be STOPPED by it, or MEET another character. This lib is that missing floor, first-byte-up: - ONE walkability grid (0=open 1=wall, the exact nx_pathfind convention) shared by movement, entity collision AND pf_astar => the player and every NPC agree on passability BY CONSTRUCTION -- there is no second copy of the map to drift (the dual-source hazard killed at design time). - an OCCUPANCY index (cell -> actor handle) kept consistent by the ONLY mover, ac_step. - BUMP-TO-INTERACT: moving into an occupied cell does not move you -- it RETURNS the occupant. The bump is the interaction primitive (NetHack/Crawl/CDDA idiom -- the ingested corpus's own model): bump an enemy = engage, bump an NPC = talk. The GAME decides; this lib only reports truthfully. Actors live in the certified nx_entity_store (handle = index+generation => stale handles detectably invalid). All integer, deterministic, no globals. LIB, no main. license_tier: ORIGINAL