Enhance middleware function argument handling

Update middleware handling to support varying argument counts.

Author: Jason2866

builder/frameworks/arduino.py

@@ -957,8 +957,21 @@ def custom_object_wrapper(node_arg, **kwargs):
                 env.Object = custom_object_wrapper
 
                 # Call user middleware - it will call our wrapper
-                for middleware_func, _ in existing_middlewares:
-                    middleware_func(env, node)
+                for middleware_func, pattern in existing_middlewares:
+                    # Mirror PlatformIO: callbacks may be def f(node) or def f(env, node)
+                    try:
+                        argcount = middleware_func.__code__.co_argcount
+                    except AttributeError:
+                        argcount = 1
+                    if argcount == 2:
+                        result = middleware_func(env, node)
+                    else:
+                        result = middleware_func(node)
+                    # Honor return value: None drops the node
+                    if result is None:
+                        return None
+                    if result is not node:
+                        node = result
 
                 # Restore original env.Object
                 env.Object = original_object