[plugins] Refresh plugin and tool caches after remote install (#28951)

Summary
- Refresh the installed remote-plugin snapshot and Codex Apps tools
after completing a remote JIT install.
- Gate `completed: true` on every expected `app_connector_id` appearing
after the uncached `tools/list` refresh, while continuing to skip local
bundle verification for server-side installs.
- Keep the cached recommendations response and filter refreshed
installed remote IDs locally, so this does not add another
recommendations fetch.
- Add regression coverage for tools appearing after the hard refresh and
remaining absent after the refresh. The resumed model request sees the
refreshed tool router when installation completes.

Root Cause
- Remote suggestions from `openai-curated-remote` returned `true` before
taking the existing connector refresh path, leaving the resumed turn
with the pre-install Apps tool catalog.

Validation
- `just test -p codex-core request_plugin_install`
- `just test -p codex-core-plugins
recommended_plugin_candidates_filter_installed_and_disabled_plugins`
- `just test -p codex-core-plugins`
- `just fix -p codex-core-plugins`
- `just fix -p codex-core`
- `just fmt`
- `just test -p codex-core` was not fully clean locally: 2,729 passed,
26 failed, and 16 skipped. The failures were dominated by local
Seatbelt/network/timing issues, including plugin-install timeouts under
full-suite contention; the focused plugin-install runs pass.

codex-rs/core-plugins/src/manager_tests.rs

@@ -4464,8 +4464,6 @@ plugins = true
 remote_plugin = true
 "#,
     );
-    write_cached_plugin(tmp.path(), REMOTE_GLOBAL_MARKETPLACE_NAME, "linear");
-
     let server = MockServer::start().await;
     Mock::given(method("GET"))
         .and(path("/ps/plugins/suggested"))
@@ -4496,7 +4494,9 @@ remote_plugin = true
     let mut config = load_config(tmp.path(), tmp.path()).await;
     config.chatgpt_base_url = server.uri();
     let manager = PluginsManager::new(tmp.path().to_path_buf());
-    manager.write_remote_installed_plugins_cache(vec![remote_installed_plugin("linear")]);
+    let mut installed_linear = remote_installed_plugin("linear");
+    installed_linear.id = "plugin_linear".to_string();
+    manager.write_remote_installed_plugins_cache(vec![installed_linear]);
     let auth = CodexAuth::create_dummy_chatgpt_auth_for_testing();
     let disabled_tools = [ToolSuggestDisabledTool::plugin(
         "github@openai-curated-remote",