• Worker cancellation now promptly removes queued jobs and replaces terminated running workers.
• Async loader and worker APIs accept shared signal and onProgress options, with typed phase
  progress and worker-local context.reportProgress support for atomic and streaming work.
• Parquet batch decoding reports rows; Draco decoding reports task start and completion.
• Authenticated loading preserves caller abort reasons through signing, credential refresh, and replay.
• Route batched parsing through explicit loader/worker capabilities, including opt-in custom and Node workers.
• Preserve CSV Arrow batch-worker support and pass loader identity through batch dispatch.
• Enable canonical Parquet worker batches for Arrow and object rows, preserving selection, schema,
  binary buffers, cancellation, and progress. Encryption callbacks retain main-thread parsing.