v5 export: candidate_states + records.onnx assignment head

v4 export: [R] role gather + heads.onnx relation scorer

v3 export: classifier + cached text_states on the same encoder

replace v1 export script with v2 exporter (pair reranker in graph)

v2 export: pair reranker in graph; verified decode parity

Add ONNX export script (local + Modal dual-mode)

Upload folder using huggingface_hub

initial commit