The benchmark tool used stale rsync-style spellings that map to
different FastSync options, so it never enabled the features it
claimed to measure:
-c -> --checksum (not compression)
-m -> --prune-empty-dirs (not multithreading)
-s -> --secluded-args, a no-op (not chunk serialization)
-f -> --filter, needs an argument (not sendfile)
Replace them with the real flags (-z, -j, --chunk-serialization,
--sendfile), force CMAKE_BUILD_TYPE=Release, route informational
output to stderr so --output json emits valid JSON, surface
client/rsync failures instead of silently dropping them, and widen
the results table for the longer config names. Update the benchmark
skill to match (correct flags, server invocation, and replace the
nonexistent test.py --full with benchmark/bench.py).
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