feat(workflow): add edge-tool routing and realtime runtime

backend/services/workflow_engine.py

@@ -117,6 +117,12 @@ class WorkflowEngine:
     def global_prompt(self) -> str:
         return str(self.settings.get("globalPrompt") or "").strip()
 
+    def runtime_mode(self) -> str:
+        return str(self.settings.get("runtimeMode") or "pipeline")
+
+    def llm_routing_mode(self) -> str:
+        return str(self.settings.get("llmRoutingMode") or "llm_router")
+
     def inherits_global_config(self, node_id: str) -> bool:
         """Return the Agent's explicit configuration scope, defaulting to global."""
         return bool(self.data(node_id).get("inheritGlobalConfig", True))
@@ -266,8 +272,17 @@ class WorkflowEngine:
         return default if include_default else None
 
     def llm_edges(self, node_id: str) -> list[dict]:
+        """Edges considered by the compatibility dedicated router."""
         return [
             edge
             for edge in self.outgoing(node_id)
             if self.edge_mode(edge) in {"llm", "always"}
         ]
+
+    def edge_tool_edges(self, node_id: str) -> list[dict]:
+        """Natural-language transitions exposed to the active Agent."""
+        return [
+            edge
+            for edge in self.outgoing(node_id)
+            if self.edge_mode(edge) == "llm"
+        ]