fix(simplex): accept display name in SIMPLEX_ALLOWED_USERS

SIMPLEX_ALLOWED_USERS silently denied every contact when operators
listed display names instead of numeric contactIds. The SimpleX UI
never surfaces the numeric id, so display names are what operators
naturally put in the env var. _is_user_authorized only compared
source.user_id (the contactId), so the allowlist never matched.

Expand check_ids to include source.user_name for the simplex platform,
mirroring the existing WhatsApp phone-LID aliasing pattern. Adds doc +
setup-prompt clarification and three regression tests.

Salvaged from PR #40393. Adds manishbyatroy to release.py AUTHOR_MAP.

gateway/run.py

@@ -7316,6 +7316,21 @@ class GatewayRunner:
             if normalized_user_id:
                 check_ids.add(normalized_user_id)
 
+        # SimpleX: SIMPLEX_ALLOWED_USERS accepts either the numeric contactId
+        # or the contact's display name. The adapter sets user_id=contactId for
+        # stability across renames, but the SimpleX UI never surfaces the
+        # numeric id — operators only see display names, so that's what they
+        # naturally put in the env var. Match both so the allowlist works
+        # regardless of which form was chosen.
+        # Plugin platform: compare by value since Platform.SIMPLEX is not a
+        # hardcoded enum member (it's a dynamic plugin platform).
+        if (
+            source.platform is not None
+            and source.platform.value == "simplex"
+            and source.user_name
+        ):
+            check_ids.add(source.user_name)
+
         return bool(check_ids & allowed_ids)
 
     def _get_unauthorized_dm_behavior(self, platform: Optional[Platform]) -> str: