Ensure minimum visible bar width for small values in benchmark graph

[konard]

Summary

• Added ensure_min_visible() helper function that ensures non-zero values are rendered with at least 0.5% of the maximum value
• Modified bench1() to apply minimum visibility to all data series before plotting
• Updated Docs/bench_rust.png and Docs/bench_rust_log_scale.png with the fixed graphs
• This guarantees approximately 2 pixels of visibility for small bars on the linear scale graph

Problem

When Doublets benchmark values are orders of magnitude smaller than Neo4j values (e.g., ~500ns vs ~50,000,000ns), the Doublets bars become completely invisible on the linear scale graph.

Solution

Calculate a minimum visible value based on the maximum value in the dataset and ensure all non-zero values are rendered at least at this minimum size. This preserves the visual indication that Doublets has a value for each operation while still showing the relative scale difference.

Test plan

• Verified the Python script runs without errors
• Verified the generated bench_rust.png shows visible bars for all Doublets values
• Verified the log scale graph (bench_rust_log_scale.png) is unaffected
• All CI checks pass

Fixes #9

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[konard]

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