Task 393: Fix Ship-Kestrel Power Budget Chart Not Rendering

Status: DONE

Summary

ship-kestrel.md has a bar-chart: directive (line 555) for power budget comparison, but this format doesn't match the summary MDX parser's fence regex. Same type of bug as Task 392. Convert to supported chart:bar YAML format.

Rationale

• Rendering bug — power budget visualization is silently broken
• Same class of bug as Task 392 (unsupported directive format)