[codex] expose remote plugin versions (#30981)

codex-rs/app-server-protocol/src/protocol/v2/plugin.rs

@@ -600,6 +600,9 @@ pub struct PluginSummary {
     pub id: String,
     /// Backend remote plugin identifier when available.
     pub remote_plugin_id: Option<String>,
+    /// Version advertised by the remote marketplace backend when available.
+    #[serde(default)]
+    pub version: Option<String>,
     /// Version of the locally materialized plugin package when available.
     #[serde(default)]
     pub local_version: Option<String>,

codex-rs/app-server-protocol/src/protocol/v2/tests.rs

@@ -3642,6 +3642,7 @@ fn plugin_share_list_response_serializes_share_items() {
                     remote_plugin_id: Some(
                         "plugins~Plugin_00000000000000000000000000000000".to_string(),
                     ),
+                    version: None,
                     local_version: None,
                     name: "gmail".to_string(),
                     share_context: None,
@@ -3663,6 +3664,7 @@ fn plugin_share_list_response_serializes_share_items() {
                 "plugin": {
                     "id": "gmail@openai-curated-remote",
                     "remotePluginId": "plugins~Plugin_00000000000000000000000000000000",
+                    "version": null,
                     "localVersion": null,
                     "name": "gmail",
                     "shareContext": null,