Changes in version 0.1.1 (2026-05-14)                  

  - Added provider-level batching for selected arXiv and NCBI operations
    to reduce unnecessary live-service requests while preserving
    existing public return shapes.
  - Added batched NCBI support for PMID, PMCID, and DOI metadata,
    linked-identifier lookup, existence checks, and supported identifier
    conversions.
  - Moved batch execution into the unary and binary dispatch engines so
    batching is handled consistently through internal dispatchers rather
    than exported API functions.
  - Added package-managed throttling for arXiv, NCBI, and Europe PMC
    requests, with user-configurable rate-limit options.
  - Added a provider-etiquette vignette documenting batching,
    throttling, live-service behavior, and relevant user options.

                 Changes in version 0.1.0 (2026-04-07)                  

Initial release.