nx_visual_arc.nx

nx_visual_arc.nx -- the VISUAL SPINE for Elder AI image generation: fixes the "clothes stayed the same, arcs never shifted" defect. The prior work had a rich identity (character DNA) and a rich wardrobe, but a single default_outfit and no advancing state -- so every render reused the same outfit and scene. This organ separates the two axes correctly: * IDENTITY ANCHOR (constant) -- the appearance description that keeps it the SAME PERSON across every render, grounded in our scenes. Never rotates. * ARC STATE (advancing) -- a per-persona step counter that indexes the wardrobe x scenes x activities as an ODOMETER, so each varc_advance() yields a NEW combination (a different outfit AND, as the wardrobe cycles, a different scene AND activity) with NO repeat until the whole space is exhausted. varc_prompt() composes IDENTITY (constant) + the current outfit/scene/activity (varying) into the exact text the sovereign generator conditions on. Integrated with the persona (one visual identity per persona id). Stored in nx_registry over seg_store (additive; rule 13). Wardrobe/scenes/activities are DATA (rule 11/25): the persona's own closet and world -- no global content policy, whatever the record holds is what renders. license_tier: ORIGINAL