Explicit Arrow reduction plus R finalization with strategy = "map_reduce".
Bounded complete-group materialization via parallel_chunks and shared_chunk.
Optional Mirai/Futurize parallelism and Mori shared memory.
User functions referenced inside captured summary quosures are identified with future::getGlobalsAndPackages() and supplied explicitly to futurized workers.
The caller’s Future plan is restored after every exit path.
Default worker count is 2.
Added a runnable Getting Started vignette covering all four execution paths.
Added pkgdown configuration and GitHub setup instructions for the project website and continuous R CMD check.