Task 381: Science Accuracy + Other Ships Additional Charts

Status: DONE

Summary

1. Add log-scale bar chart to science-accuracy.md showing Hohmann→Brachistochrone time reduction factors (376x to 1,674x across 5 episodes)
2. Add ΔV capability bar chart to other-ships.md comparing estimated ΔV across vessel types

Rationale

• "Diagrams and graphs for clarity" — CLAUDE.md directive
• The 短縮倍率 values (376x-1674x) are the most impressive numbers in the report, buried in a table
• The other-ships ΔV comparison table would be more intuitive as a bar chart