Registers an IWorkerPool under CAPABILITIES.WORKER_POOL. Single
instance only (duplicate registration throws at startup via the resolver).
On runtimes without worker threads (Cloudflare Workers) the plugin still
registers; run() then throws WorkerPoolUnavailableError.
Creates the WorkerPoolPlugin.
Registers an
IWorkerPoolunderCAPABILITIES.WORKER_POOL. Single instance only (duplicate registration throws at startup via the resolver). On runtimes without worker threads (Cloudflare Workers) the plugin still registers;run()then throwsWorkerPoolUnavailableError.