Task 227: Fix EP05 relativistic analysis to use damaged thrust (65%)

Status: DONE

Problem

The relativistic analysis used full thrust (9.8 MN) for EP05's brachistochrone computation, giving β_max = 3.14%c and peak velocity 9431 km/s. However, EP05 operates with damaged engines at 65% thrust (6.37 MN). This caused a discrepancy with the EP05 episode analysis (7604 km/s = 2.54%c) and the cross-episode report text ("最大2.5%c").

Changes

Fix: Use KESTREL.damagedThrustN (6.37 MN) instead of KESTREL.thrustN (9.8 MN) for EP05 scenario
Result: β_max corrected from 3.14%c → 2.54%c, cumulative dilation 174s → 156s
Cross-episode heading: "光速の1〜3%" → "光速の1〜2.5%"
Test: Added consistency assertion (EP05 peak < 8000 km/s, β < 3%c)
Regenerated: relativistic_effects.json with correct EP05 values

Files

ts/src/relativistic-analysis.ts — use damagedThrustN
ts/src/relativistic-analysis.test.ts — consistency test + comment update
reports/data/calculations/relativistic_effects.json — regenerated
reports/data/summary/cross-episode.md — heading fix