Add Feasible Speed Range Summary

[ethancoon]

Description

Add a summary that identifies the feasible speed range from fixed-speed sweep results.

The summary should identify:

• Slowest feasible speed
• Fastest feasible speed
• Number of feasible speeds tested
• Best fixed-speed candidate
• Whether no tested speeds were feasible
• Whether all tested speeds were feasible

This helps the team quickly understand which speeds are likely to finish with enough energy margin.

Acceptance Criteria

• Fixed-speed sweep results include a feasible speed range summary.
• The slowest feasible speed is reported.
• The fastest feasible speed is reported.
• The best fixed-speed candidate is reported.
• The summary handles no-feasible-speed cases.
• The summary handles all-feasible-speed cases.
• Tests or manual verification cover mixed, none-feasible, and all-feasible sweep results.

Notes

This is a Feature because it adds a new planning capability: summarizing feasible speed ranges from sweep results.

References

• Add Energy Margin To Planning Results #66
• Improve Fixed-Speed Sweep Summary #67
• sim/planning/sweep.py
• sim/planning/report.py