Task 551: Cross-episode analysis test expansion

Status: DONE

Summary

Added 9 tests to cross-episode-analysis.test.ts (22→31):

SHIP_SPECS (3→5)

1. Emergency thrust exceeds nominal thrust
2. Damaged thrust is between 0 and nominal

EPISODE_SUMMARIES (6→9)

1. EP04 and EP05 both arrive at Earth
2. All episodes have non-empty route strings with → separator
3. Damaged thrust episodes (EP04/EP05) use lower thrust than EP01/EP03

buildAccuracyTable (new, 0→2)

1. Has accuracy and physics limits rows
2. All rows have ok status

buildTimelineTable (new, 0→2)

1. Has rows referencing EP01 through EP04
2. All rows have valid status values

Impact

• Stats: 3,997 TS, 531 Rust, 265 E2E (4,793 total)
• Cross-episode module now has tests for all 5 exported table builders