nx_actor_role_llm_v2_autoreg_test.nx

nx_actor_role_llm_v2_autoreg_test.nx -- reset state-machine smoke for nx_lv_actor_reset_for_next_token. Honest scope: this tests the RESET state-machine logic in isolation (does it correctly roll an actor from DONE back to INIT? does it reject invalid inputs?). The full multi-token-through-real-transformer loop hits an nxc2 preprocessor edge when combined with the GGUF fixture code in one .nx file -- future work splits the fixture into a sibling file or pre-builds it via a fixture primitive. For now the single-token real-transformer path is verified in nx_actor_role_llm_v2_real_test.nx; this smoke proves the reset substrate handles all valid + invalid input paths.