Federated RAG retrieval currently flattens module outputs, which makes it impossible to combine ranked…

Federated RAG retrieval currently flattens module outputs, which makes it impossible to combine ranked…: a task in MiMo-V2.6-RL-oss: Agentic RL Environments (MiMo RL release). Extend the public RetrievalRagStage and RagContext APIs with deterministic fusion and diagnostics while preserving…