[plugins] Fix plugin explicit mention context management. (#15372)

- [x] Fix plugin explicit mention context management.

codex-rs/core/src/codex.rs

@@ -5510,20 +5510,6 @@ pub(crate) async fn run_turn(
         &available_connectors,
         &skill_name_counts_lower,
     ));
-    // Explicit plugin mentions can make a plugin's enabled apps callable for
-    // this turn without persisting those connectors as sticky user selections.
-    let mut turn_enabled_connectors = explicitly_enabled_connectors.clone();
-    turn_enabled_connectors.extend(
-        mentioned_plugins
-            .iter()
-            .flat_map(|plugin| plugin.app_connector_ids.iter())
-            .map(|connector_id| connector_id.0.clone())
-            .filter(|connector_id| {
-                available_connectors
-                    .iter()
-                    .any(|connector| connector.is_enabled && connector.id == *connector_id)
-            }),
-    );
     let connector_names_by_id = available_connectors
         .iter()
         .map(|connector| (connector.id.as_str(), connector.name.as_str()))
@@ -5675,7 +5661,7 @@ pub(crate) async fn run_turn(
             &mut client_session,
             turn_metadata_header.as_deref(),
             sampling_request_input,
-            &turn_enabled_connectors,
+            &explicitly_enabled_connectors,
             skills_outcome,
             &mut server_model_warning_emitted_for_turn,
             cancellation_token.child_token(),

codex-rs/core/src/codex_tests.rs

@@ -641,6 +641,21 @@ fn filter_connectors_for_input_skips_disabled_connectors() {
     assert_eq!(selected, Vec::new());
 }
 
+#[test]
+fn filter_connectors_for_input_skips_plugin_mentions() {
+    let connectors = vec![make_connector("figma", "Figma")];
+    let input = vec![user_message("use [@figma](plugin://figma@openai-curated)")];
+    let explicitly_enabled_connectors = HashSet::new();
+    let selected = filter_connectors_for_input(
+        &connectors,
+        &input,
+        &explicitly_enabled_connectors,
+        &HashMap::new(),
+    );
+
+    assert_eq!(selected, Vec::new());
+}
+
 #[test]
 fn collect_explicit_app_ids_from_skill_items_includes_linked_mentions() {
     let connectors = vec![make_connector("calendar", "Calendar")];