Merge remote-tracking branch 'origin/master' into xuhd

# Conflicts:
#	frontend-web/.env.production
#	frontend-web/.env.sit
#	frontend-web/package.json
#	offline-backend-20260512/backend/config.yaml

offline-backend-20260512/backend/packages/harness/deerflow/agents/lead_agent/agent.py

@@ -299,6 +299,16 @@ def _build_middlewares(
     if not is_bootstrap and not is_writing_setup:
         middlewares.append(MemoryMiddleware(agent_name=agent_name, memory_config=resolved_app_config.memory, injection_enabled=memory_injection_enabled))
 
+    # KnowledgeRagMiddleware — inject knowledge-base recall (phase 2). Gated
+    # per-conversation by the ``knowledge_rag_enabled`` runtime flag, defaulting
+    # to the global ``knowledge.rag_enabled`` config. No-op when knowledge is
+    # disabled. Skipped in bootstrap/writing-setup like MemoryMiddleware.
+    knowledge_cfg = getattr(resolved_app_config, "knowledge", None)
+    if not is_bootstrap and not is_writing_setup and knowledge_cfg is not None and knowledge_cfg.enabled:
+        from deerflow.agents.middlewares.knowledge_rag_middleware import KnowledgeRagMiddleware
+
+        middlewares.append(KnowledgeRagMiddleware(limit=knowledge_cfg.rag_limit, default_enabled=knowledge_cfg.rag_enabled))
+
     # Add ViewImageMiddleware only for the NATIVE-vision path (main model
     # ingests raw image data). In delegated mode the view_image tool already
     # returns a text description and stores nothing in `viewed_images`, so the