docs: link STT paper arXiv:2605.03073 (and LASE arXiv:2605.00777 on r2 cards)

fix: set peft.task_type to SEQ_2_SEQ_LM (was null, tripping HF model-card validator)

Initial release: Praxy-STT-TA-rb (vasista22 + EDSA LoRA)

initial commit