Deep Researchエージェントの構築。Qwen3 14Bベースで合成データを活用、「In the first stage, we perform supervised finetuning (SFT) as a cold start, in order to instill long-horizon search behavior into the model.」、「In the second stage, we apply RL to refine its ability of reasoning-driven tool use.」の2段階でのpost training。