feat(plugins): expose read-only estimated plan host api

apps/desktop/src/components/plugins/PluginWorkbenchHost.vue

@@ -83,6 +83,10 @@ function createBridge() {
       openWorkbench: async (pluginId, contributionId, context, options) => emit("openWorkbench", pluginId, contributionId, context, options),
       openFilesystem: async (pluginId, providerId, context) => emit("openFilesystem", pluginId, providerId, context),
       reopenConnection: (pluginId, connectionId) => useConnectionStore().reopenPluginConnection(connectionId, pluginId),
+      // Both plan calls carry the plugin's declared `host.plans:read` gate in the
+      // bridge; the backend owns EXPLAIN generation, the timeout, and the plan cap.
+      getPlanCapabilities: (connectionId) => api.getPluginPlanCapabilities(connectionId),
+      explainPlan: (request) => api.getPluginEstimatedPlan(request),
       closeTab: () => emit("closeTab"),
       saveFile: (_pluginId, request, data) => savePluginFile(request, data),
       downloadFile: isTauriRuntime() ? downloadPluginFile : undefined,