docs: regenerate benchmark charts with all 7 set implementations #none

[freeformz]

Summary

The README's performance graphs only showed 5 of the 7 set implementations: the committed bench_stats.csv predated SortedSet and BitSet, and bench_plot.py silently dropped any implementation missing from its hardcoded IMPL_ORDER list.

• benchmarks/regenerate.sh (new): one-step regeneration of the CSV and all charts. Runs TestBenchStats across every implementation registered in benchImpls, so future set types are picked up automatically. Supports --plot-only to re-plot from the existing CSV, and falls back to uv run --with matplotlib when matplotlib isn't installed.
• bench_plot.py: covers all 7 implementations; warns and plots (in black) any implementation found in the CSV but missing from IMPL_ORDER instead of silently dropping it; switches to a colorblind-safe categorical palette (validated: adjacent-pair CVD ΔE ≥ 8) with distinct per-series markers; y-axis is now log scale — the series span ~4 orders of magnitude (word-wise BitSet ops vs element-wise iteration), which a linear axis flattened into the x-axis.
• Regenerated bench_stats.csv and all 11 charts from a fresh full run (sizes 10 → 1,000,000, 30 samples/op). BitSet appears in the int panels only (integer-only implementation, as documented).
• README: benchmark section now leads with the regeneration script.

Verification

• ./benchmarks/regenerate.sh --plot-only reproduces the committed charts from the committed CSV.
• CSV impl column contains all 7 implementations; charts eyeballed — every series visible and distinguishable in both int and string panels.

🤖 Generated with Claude Code

https://claude.ai/code/session_01VjUKQx2QYDuetR8z8GkGyU

[Copilot]

Pull request overview

Updates the benchmark documentation and artifacts so the README charts reflect all 7 set implementations (including SortedSet and BitSet) and can be regenerated reliably going forward.

Changes:

• Add benchmarks/regenerate.sh to regenerate bench_stats.csv and re-render charts in one step (with a --plot-only mode).
• Update benchmarks/bench_plot.py to include all implementations, avoid silently dropping unknown series, add markers + a colorblind-safe palette, and switch the y-axis to log scale.
• Regenerate benchmarks/bench_stats.csv with fresh benchmark results including all implementations.

Reviewed changes

Copilot reviewed 3 out of 15 changed files in this pull request and generated 2 comments.

File	Description
README.MD	Adds a quick “regenerate benchmarks” section pointing to the new script.
benchmarks/regenerate.sh	New helper script to (re)generate the benchmark CSV and charts.
benchmarks/bench_stats.csv	Updated benchmark dataset used to produce the README charts.
benchmarks/bench_plot.py	Updates plotting to handle all implementations and improve chart readability.

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[Copilot]

🟡 Not ready to approve

The new regeneration script should fail fast on unknown CLI args, and the plotting fallback for “extra” implementations should keep multiple unknown series visually distinguishable.

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Review details

Suppressed comments (2)

benchmarks/bench_plot.py:113

• For implementations present in the CSV but missing from IMPL_ORDER, everything currently defaults to black with the same marker, so multiple “extra” series become visually indistinguishable even though the header comment says identity should not rely on color alone. Assign a distinct marker/linestyle for each extra impl to keep the chart readable when more than one unknown impl appears.

            color = COLORS.get(impl, '#000000')
            marker = MARKERS.get(impl, 'o')
            ax.plot(sizes, avgs, label=impl, color=color, linewidth=2,
                    marker=marker, markersize=5)
            ax.fill_between(sizes, mins, maxs, alpha=0.12, color=color)

benchmarks/regenerate.sh:37

• --plot-only is the only supported flag, but any other argument currently falls through and triggers the full benchmark run. That can be surprising (and expensive) if someone mistypes a flag or tries --help; it should fail fast on unknown options and on extra args.

if [[ "${1:-}" != "--plot-only" ]]; then
    echo "==> Running statistical benchmarks (this takes a while)..."
    BENCH_STATS=1 BENCH_STATS_OUT="$CSV" \
        go test -v -run TestBenchStats -count=1 -timeout 180m .
fi

• Files reviewed: 3/15 changed files
• Comments generated: 0 new
• Review effort level: Lite

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