Preserve app invocation context across MCP tool refreshes (#59991)

## What changed

Keep the advertised `_codex_apps.invocation_context` when an app's tool metadata refreshes on the same server connection, while using refreshed values for other metadata. If the invocation context changes on a different connection, skip the call as unavailable.

## Testing

Extend the code-mode compaction test to refresh app tools before resuming a cell and verify that calls retain the original invocation context while picking up the refreshed `resource_uri`.

GitOrigin-RevId: 1b6072faed74623994ea82035a6ed977451984a4

codex-rs/core/tests/suite/code_mode.rs

@@ -2031,10 +2031,17 @@ fn result_metadata_apps_builder(base_url: String, account_email: &str) -> TestCo
 async fn code_mode_mcp_metadata_keeps_originating_window_after_compaction() -> Result<()> {
     skip_if_no_network!(Ok(()));
     let server = responses::start_mock_server().await;
-    let apps_server = mount_result_metadata_app(
-        &server, /*result_metadata*/ None, /*is_error*/ false,
-    )
-    .await?;
+    let tools = Arc::new(Mutex::new(vec![serde_json::json!({
+        "name": RESULT_METADATA_TOOL,
+        "inputSchema": { "type": "object" },
+        "annotations": { "readOnlyHint": true },
+        "_meta": {
+            "connector_id": "test_connector",
+            "connector_name": "MessageSearch",
+            "_codex_apps": { "invocation_context": "original" },
+        },
+    })]));
+    let apps_server = AppsTestServer::mount_with_tools(&server, Arc::clone(&tools)).await?;
     let (reached_tx, reached_rx) = oneshot::channel();
     let (release_tx, release_rx) = oneshot::channel();
     let control = Arc::new(ResultMetadataTestControl {
@@ -2118,6 +2125,11 @@ text("done");"#,
         "wait",
     )
     .await;
+    tools.lock().unwrap()[0]["_meta"]["_codex_apps"] = serde_json::json!({
+        "invocation_context": "refreshed",
+        "resource_uri": "connector://messages/search",
+    });
+    test.codex.refresh_codex_apps_tools().await?;
     release_tx.send(()).unwrap();
     test.submit_turn("Finish the code-mode cell").await?;
     let resumed_request = resumed.function_call.single_request();
@@ -2138,8 +2150,13 @@ text("done");"#,
     );
     let calls = recorded_apps_tool_calls(&server).await;
     assert_eq!(calls.len(), 2);
+    assert_eq!(
+        calls[1]["params"]["_meta"]["_codex_apps"]["resource_uri"],
+        "connector://messages/search"
+    );
     for call in calls {
         let meta = &call["params"]["_meta"];
+        assert_eq!(meta["_codex_apps"]["invocation_context"], "original");
         assert_eq!(
             serde_json::json!({
                 "sessionId": meta["sessionId"],