feat(assistant): optimize MCP and custom widget authoring (#6743)

* feat(assistant): optimize MCP and custom widget authoring

* fix(assistant): isolate server-safe JSX analyzer

* refactor(assistant): generate MCP tool staging

* fix(assistant): preserve widget placement follow-up

* fix(ci): allow fast gate to finish

* fix(custom-widgets): address review findings

* fix(custom-widgets): split preview evidence module

* style: format assistant custom widget files

* fix(custom-widgets): sync formatted skill schema

packages/api/src/assistant.ts

@@ -1,8 +1,10 @@
 export {
   getAssistantContextEntitiesAsync,
+  getAssistantRequestContextEntitiesAsync,
   getAssistantModelsAsync,
   getSelectedModelDetailsAsync,
   type AssistantContextEntity,
+  type AssistantContextReference,
 } from "./router/assistant";
 export type { OpenRouterGenerationTelemetry } from "./assistant-generation-telemetry";
 export { createAssistantGenerationAccessToken } from "./assistant-generation-access";