nx_vn_living.nx

nx_vn_living.nx -- the "LIVING but it still TRACKS" engine for the VN (operator: interactions can be LLM-run IN LIMITS so they feel living, but the story stays on its rails). The hard part is the LIMITS, and they must hold for ANY interaction provider -- a deterministic template now, a sovereign no-float LLM later. Design: - a scene carries CANON: a required FACT (must appear) + a FORBIDDEN string (must never appear) + an authored fallback line that is itself on-canon. - a PROVIDER generates a living interaction line (varied). Could be an LLM. - the VALIDATOR (vl_ok) is THE LIMIT: it accepts the line ONLY if it keeps canon (has fact, lacks forbidden). - vl_interact runs the provider, validates, and FALLS BACK to the authored canon line if it derails -> so the final line is ALWAYS on-canon. An unbounded/hallucinating provider can vary the flavour but CANNOT break the plot. That is "living interactions, story still tracks", made mechanical + provider-agnostic. license_tier: ORIGINAL