nx_quad_companion_compose_test.nx

nx_quad_companion_compose_test.nx -- 4-modality concurrent integration. Closes the parallel-companion north star: FOUR actors of DIFFERENT modalities running interleaved through one scheduler + message bus + multiplexer. NARRATOR (LLM, priority 80) -- nx_actor_role_llm NPC (LLM, priority 60) -- nx_actor_role_llm AUDIO_QC (audio grader, priority 50) -- nx_actor_role_audio_grader GAME_LOGIC (tictactoe, priority 70) -- nx_actor_role_game_logic Replaces the image grader from the original quad attempt with the lighter-deps game-logic actor per [[feedback-nxc2-module-const-ceiling]] guidance. Each actor calls a DIFFERENT other-agent / sibling-arc primitive: LLM -> nx_embedding_lookup + nx_blas_matmul + nx_sample_categorical AUDIO -> nx_audio_scene_grade (5-axis Q14 verdict) GAME -> nx_ttt_pick + nx_ttt_try_apply + nx_ttt_evaluate Proves the substrate handles arbitrary heterogeneous modalities through one uniform actor + message + multiplexer pipeline.