Add fake cosmos_guardrail module

cosmos_guardrail.py

@@ -0,0 +1,14 @@
+"""Fake cosmos_guardrail module to satisfy diffusers import"""
+
+class CosmosSafetyChecker:
+    def __init__(self):
+        pass
+    
+    def __call__(self, frames, **kwargs):
+        return frames
+    
+    def check_text_safety(self, text):
+        return True
+    
+    def check_video_safety(self, frames):
+        return frames