fix: track routing decisions (cascade/direct) in streaming telemetry

Previously, streaming requests only updated streaming_used and tool_queries
stats, but not cascade_used or direct_routed. This fix ensures routing
decisions are properly recorded for streaming requests, matching the
behavior of non-streaming run() method.

Author: Mono

cascadeflow/agent.py

@@ -1946,6 +1946,11 @@ async def stream_events(
         # Basic telemetry recording
         self.telemetry.stats["total_queries"] += 1
         self.telemetry.stats["streaming_used"] += 1
+        # 🔧 FIX: Track routing decision for streaming requests
+        if use_cascade:
+            self.telemetry.stats["cascade_used"] += 1
+        else:
+            self.telemetry.stats["direct_routed"] += 1
         if tools:
             if "tool_queries" not in self.telemetry.stats:
                 self.telemetry.stats["tool_queries"] = 0