Add plugin reconciliation app-server API (#41949)

## What changed

- Add the `plugin/reconcile` JSON-RPC method to synchronize installed remote plugin bundles and wait for required hook updates.
- Return affected plugin IDs with MCP, Apps, hooks, and skills refresh hints, plus remote update and materialization failures.
- Refresh loaded hook runtimes after relevant updates and return an empty result when plugins or backend authentication are unavailable.

## Testing

- Cover workspace and global bundle installs, unchanged passes, enablement changes, updates, removals, materialization failures, hook refreshes, and disabled plugins.

GitOrigin-RevId: 45c02518d71990d13eb09d56ed51505c91c66956

codex-rs/app-server/src/message_processor.rs

@@ -1377,6 +1377,15 @@ impl MessageProcessor {
             ClientRequest::PluginInstalled { params, .. } => {
                 self.plugin_processor.plugin_installed(params).await
             }
+            ClientRequest::PluginReconcile { params, .. } => {
+                self.plugin_processor
+                    .plugin_reconcile(
+                        params,
+                        self.config_processor.clone(),
+                        &self.request_serialization_queues,
+                    )
+                    .await
+            }
             ClientRequest::PluginRead { params, .. } => {
                 self.plugin_processor.plugin_read(params).await
             }