model card: name the live checkpoint, no browser fallback, current error mix

round 4 control (r4-ctl-stage2-last) int8

run A (r3a-stage2-best-real) int8: decoder_with_past_model

run A (r3a-stage2-best-real) int8: decoder_model

run A (r3a-stage2-best-real) int8: encoder_model

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initial commit