[codex] Return workspace directory installed plugins (#27098)

## Summary

- return installed `workspace-directory` remote plugins by default in
`plugin/installed`
- keep shared-with-me installed plugins gated behind `plugin_sharing`
- filter remote installed plugin marketplaces by canonical marketplace
name instead of coarse workspace scope

## Validation

- `just fmt`
- `just test -p codex-core-plugins`
- `just test -p codex-app-server`
- `just fix -p codex-core-plugins`
- `just fix -p codex-app-server`
- `$xin-build` targeted verification:
- `just test -p codex-core-plugins
build_remote_installed_plugin_marketplaces_from_cache_filters_by_marketplace_name`
- `just test -p codex-app-server
plugin_installed_includes_workspace_directory_without_plugin_sharing`
- `just test -p codex-app-server
plugin_installed_includes_remote_shared_with_me_plugins`
- `just test -p codex-app-server
plugin_list_omits_shared_with_me_kind_when_plugin_sharing_disabled`

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

@@ -38,7 +38,6 @@ use crate::marketplace_upgrade::configured_git_marketplace_names;
 use crate::marketplace_upgrade::upgrade_configured_git_marketplaces;
 use crate::remote::RemoteInstalledPlugin;
 use crate::remote::RemotePluginCatalogError;
-use crate::remote::RemotePluginScope;
 use crate::remote::RemotePluginServiceConfig;
 use crate::remote_legacy::RemotePluginFetchError;
 use crate::remote_legacy::RemotePluginMutationError;
@@ -560,14 +559,19 @@ impl PluginsManager {
 
     pub fn build_remote_installed_plugin_marketplaces_from_cache(
         &self,
-        visible_scopes: &[RemotePluginScope],
+        visible_marketplaces: &[&str],
     ) -> Option<Vec<crate::remote::RemoteMarketplace>> {
         let cache = match self.remote_installed_plugins_cache.read() {
             Ok(cache) => cache,
             Err(err) => err.into_inner(),
         };
         let plugins = cache.as_ref()?;
-        Some(crate::remote::group_remote_installed_plugins_by_marketplaces(plugins, visible_scopes))
+        Some(
+            crate::remote::group_remote_installed_plugins_by_marketplaces(
+                plugins,
+                visible_marketplaces,
+            ),
+        )
     }
 
     pub fn cached_global_remote_discoverable_plugins_for_config(
@@ -599,7 +603,7 @@ impl PluginsManager {
         &self,
         config: &PluginsConfigInput,
         auth: Option<&CodexAuth>,
-        visible_scopes: &[RemotePluginScope],
+        visible_marketplaces: &[&str],
         on_effective_plugins_changed: Option<Arc<dyn Fn() + Send + Sync + 'static>>,
     ) -> Result<Vec<crate::remote::RemoteMarketplace>, RemotePluginCatalogError> {
         let plugins = crate::remote::fetch_remote_installed_plugins(
@@ -607,8 +611,10 @@ impl PluginsManager {
             auth,
         )
         .await?;
-        let marketplaces =
-            crate::remote::group_remote_installed_plugins_by_marketplaces(&plugins, visible_scopes);
+        let marketplaces = crate::remote::group_remote_installed_plugins_by_marketplaces(
+            &plugins,
+            visible_marketplaces,
+        );
         let changed = self.write_remote_installed_plugins_cache(plugins);
         if changed && let Some(on_effective_plugins_changed) = on_effective_plugins_changed {
             on_effective_plugins_changed();