Assistant 功能
  -> 工作台视图宿主
  -> agent.workbench.main / agent.workbench.fixed
  -> ViewExtensionProvider
  -> XpertExtensionViewManifest
  -> 平台声明式渲染器或远程组件

Agent 中间件声明 Feature
  -> Assistant 连接该中间件
  -> 视图宿主获得功能
  -> 对应 View 才可见

activation: {
  requiredFeatures: ['contract-review']
}

import {
  type IXpertViewExtensionProvider,
  ViewExtensionProvider
} from '@xpert-ai/plugin-sdk'
import type {
  XpertExtensionViewManifest,
  XpertResolvedViewHostContext,
  XpertViewDataResult,
  XpertViewQuery
} from '@xpert-ai/contracts'

@ViewExtensionProvider('contract_review')
export class ContractReviewViewProvider
  implements IXpertViewExtensionProvider
{
  constructor(private readonly reviewService: ContractReviewService) {}

  supports(context: XpertResolvedViewHostContext) {
    return context.hostType === 'agent'
  }

  getViewManifests(
    _context: XpertResolvedViewHostContext,
    slot: string
  ): XpertExtensionViewManifest[] {
    if (slot !== 'agent.workbench.main') return []
    return [createContractReviewManifest(slot)]
  }

  async getViewData(
    context: XpertResolvedViewHostContext,
    viewKey: string,
    query: XpertViewQuery
  ): Promise<XpertViewDataResult> {
    return this.reviewService.getViewData(context, viewKey, query)
  }
}

<providerKey>__<manifestKey>