Method setQueryPool

src/mcp/tools.ts:859–861

* Engine-only: attach (or detach with null) the worker-thread query pool. The * shared daemon sets this once its default project is open; the workers each * hold their own WAL read connection and run executeReadTool. A * worker's own ToolHandler never has a pool, so there is no nest

(pool: QueryPool | null)

   * worker's own ToolHandler never has a pool, so there is no nested off-loading.
   */
  setQueryPool(pool: QueryPool | null): void {
    this.queryPool = pool;
  }

  /**
   * Update the default CodeGraph instance (e.g. after lazy initialization)