LongBanana: Long-Horizon Multi-Reference Image Generation Benchmark

Anonymous preview record for the LongBanana benchmark release package. The planned release includes case schemas, split assignments, reference-image inventories, target instructions, checklist items, rubric dimensions, evaluator-facing metadata, model and evaluator configuration, and documentation for long-horizon multi-reference image generation evaluation. This draft record is used only for double-blind private preview setup; final public files and licensing metadata will be completed after the artifact-release audit.