Four vintage car advertisements arranged in a heritage grid

2x2 grid, 16:9, 4 unusual inventions that are real    STATES:   S0: input_or_infer_vehicles( $ INVENTION_LIST ) → list of 4 unique real car models   S1: for each vehicle:         S1a: random_pick(3 eras from pool, 3 graphics from pool) without duplicate         S1b: assign 60/30/10 (dominant/secondary/accent)         S1c: generate campaign name, headline, provenance tagline using model & era         S1d: render ad image with exact car identity, blending eras/graphics per hierarchy              (dominant defines color temperature, layout; secondary adds paper/map elements; accent adds foil or stamp)         S1e: enforce no fake numbers/awards, preserve historical plausibility   S2: arrange four ad images into 2x2 grid (16:9 aspect)   S3: final render as elegant heritage exhibition poster