Data::Shared benchmark notes

Recorded dispatch measurements and their environment are documented in the
PERFORMANCE section of Data::Shared (perldoc Data::Shared).

Commands for fresh measurements against the installed backends:
  DS_BENCH_TIME=2 perl bench/benchmark.pl
  DS_BENCH_TIME=2 perl bench/overhead.pl
  DS_BENCH_TIME=1 perl bench/composite.pl
  perl bench/mounts.pl

The historical 2026-10-17 samples have been removed. They predated the
released implementation, their exact source revision was not recorded, and
the dispatch table duplicated the POD with different results. The notes
also mixed samples and denominator corrections without complete provenance.

Run on an idle host and record the source revision, Perl/backend versions,
commands and environment with the output. CPU throughput and warm-cache
composite timings do not describe cold-storage latency or crash durability.

See bench/scaling.pl for creation, RSS, working-set and contention experiments.
