Method setQueryPool

src/mcp/tools.ts:1974–1976

* Engine-only: attach (or detach with null) the worker-thread query pool. The * engine sets this after resolving its default project; 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 nested o

(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;
  }

  /**
   * Engine-only: own the lifecycle (watcher, catch-up, writer lock) of every