Fix custom tool registration in CrewAI 0.150.0

- Update validate_tools method in BaseAgent to accept all documented tool patterns:
  * Function tools (with or without @tool decorator)
  * Dict-based tool definitions
  * BaseTool class inheritance
  * Direct function assignment
- Change tools field type annotation from List[BaseTool] to List[Any] to allow Pydantic validation
- Update parse_tools function to accept all BaseTool instances (not just CrewAITool)
- Add comprehensive tests covering all custom tool patterns from issue #3226
- Add reproduction script to verify all patterns work correctly

Fixes #3226

Co-Authored-By: João <joao@crewai.com>

src/crewai/utilities/agent_utils.py

@@ -30,10 +30,13 @@ def parse_tools(tools: List[BaseTool]) -> List[CrewStructuredTool]:
     tools_list = []
 
     for tool in tools:
-        if isinstance(tool, CrewAITool):
+        if isinstance(tool, BaseTool):
             tools_list.append(tool.to_structured_tool())
         else:
-            raise ValueError("Tool is not a CrewStructuredTool or BaseTool")
+            raise ValueError(
+                f"Tool must be a BaseTool instance, got {type(tool)}. "
+                "Ensure tools are properly validated before calling parse_tools."
+            )
 
     return tools_list