Add manual benchmark workflow with benchstat comparison - #10
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Add a workflow_dispatch-triggered Benchmarks workflow so benchmarks can be run on GitHub-hosted runners on demand (Actions tab -> Benchmarks -> Run workflow). - Runs on both amd64 (ubuntu-latest) and arm64 (ubuntu-24.04-arm) hosted runners, since the two architectures differ in general-purpose register count and these register-bound ARX ciphers are sensitive to it. - Installs benchstat (golang.org/x/perf) and uses -count=6 so results are reported as median +/- variance rather than raw repeated lines. - Optional compare_ref input: when set to a branch/tag/SHA, the workflow also benchmarks that ref and prints a benchstat A/B table (delta + p-value) versus the current ref. Branch names are resolved via origin/<ref> (after fetch-depth:0), falling back to the ref verbatim for tags and SHAs. - Results are published to each job summary, labeled with runner/arch/Go version.
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Add a workflow_dispatch-triggered Benchmarks workflow so benchmarks can be run on GitHub-hosted runners on demand (Actions tab -> Benchmarks -> Run workflow).