fix: pass customer_id directly to tools instead of state

- Avoids JSON serialization errors with HumanMessage objects
- schedule_appointment now receives customer_id as direct parameter

src/naliiabot/bot/agent/agent.py

@@ -228,7 +228,9 @@ class Agent:
         tool_results: list[BaseMessage] = []
 
         for tool_call in last_message.tool_calls:
-            result = self._execute_tool(tool_call, state)
+            result = self._execute_tool(
+                tool_call, state.get("customer_id"), state.get("customer_name")
+            )
             tool_results.append(result)
 
             if self._post_tool_hook:
@@ -236,7 +238,9 @@ class Agent:
 
         return {"messages": state["messages"] + tool_results}
 
-    def _execute_tool(self, tool_call: dict, state: MessagesState) -> ToolMessage:
+    def _execute_tool(
+        self, tool_call: dict, customer_id=None, customer_name=None
+    ) -> ToolMessage:
         """
         Ejecuta una herramienta individual con manejo de errores.
         """
@@ -253,7 +257,10 @@ class Agent:
 
         try:
             tool = self._tools_by_name[tool_name]
-            tool_args["state"] = state
+            if customer_id is not None:
+                tool_args["customer_id"] = customer_id
+            if customer_name is not None:
+                tool_args["customer_name"] = customer_name
             observation = tool.invoke(tool_args)
 
             return ToolMessage(