bench: compare BuildTimer wrapper overhead with GNU time - #10
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Adds a reproducible benchmark for the shared one-shot task: execute a command, wait for it, measure duration, and preserve the wrapped command's exit status.
Compared tools:
/usr/bin/timeCorrectness gate: both wrappers must preserve an explicit exit code 7 before timing.
The timed workload uses
/bin/trueto expose wrapper overhead. BuildTimer additionally persists local command history, so results are explicitly scoped to one-shot wrapper overhead and are not a universal feature/value ranking. Raw Hyperfine and resource evidence are retained.