fix(graph): integrate #487 + #567 — sentiment label, route, propagate asset_type

- analyst_execution.py: rename "Social Analyst" / "Msg Clear Social"
  to "Sentiment Analyst" / "Msg Clear Sentiment" to match v0.2.5.
- conditional_logic.should_continue_social returns the renamed route.
- TradingAgentsGraph.propagate accepts asset_type and threads through
  to Propagator.create_initial_state.
- Regression test on the Sentiment Analyst label.

Verified end-to-end (NVDA stock + BTC-USD crypto) on gpt-5.4-mini.

tradingagents/graph/conditional_logic.py

@@ -20,12 +20,18 @@ class ConditionalLogic:
         return "Msg Clear Market"
 
     def should_continue_social(self, state: AgentState):
-        """Determine if social media analysis should continue."""
+        """Determine if sentiment-analyst tool round should continue.
+
+        Method name keeps the legacy ``social`` suffix to match the
+        ``AnalystType.SOCIAL = "social"`` wire value (saved-config
+        back-compat); the returned ``clear_node`` label uses the v0.2.5
+        rename so it matches the node registered by the execution plan.
+        """
         messages = state["messages"]
         last_message = messages[-1]
         if last_message.tool_calls:
             return "tools_social"
-        return "Msg Clear Social"
+        return "Msg Clear Sentiment"
 
     def should_continue_news(self, state: AgentState):
         """Determine if news analysis should continue."""