[docs] add callouts and comparision to clear the problem of when to use Infer=True/False (#3738)

docs/platform/features/direct-import.mdx

@@ -31,6 +31,10 @@ You can see that the output of the add call is an empty list.
 
 <Note>Only messages with the role "user" will be used for storage. Messages with roles such as "assistant" or "system" will be ignored during the storage process.</Note>
 
+<Warning>
+Direct import skips the inference pipeline, so it also skips duplicate detection. If you later send the same fact with `infer=True`, Mem0 will store a second copy. Pick one mode per memory source unless you truly want both versions.
+</Warning>
+
 ## How to Retrieve Memories
 
 You can retrieve memories using the `search` method.
@@ -98,4 +102,4 @@ client.get_all(query="What is Alice's favorite sport?", user_id="alice")
 
 If you have any questions, please feel free to reach out to us using one of the following methods:
 
-<Snippet file="get-help.mdx" />
+<Snippet file="get-help.mdx" />