Task 222: Fix incorrect timeline dates in EP03, EP05, and cross-episode table

Status: DONE

Problem

Several reports contain incorrect dates that don't match the computed timeline:

Computed timeline (from computeTimeline() anchored at 2240):

• EP01: 2241-09-05 → 2241-09-08 ✅
• EP02: 2241-09-11 → 2241-12-07 ✅
• EP03: 2241-12-09 → 2241-12-15
• EP04: 2241-12-17 → 2242-01-07
• EP05: same as EP04 (departure = EP03 arrival + 2d)

Wrong dates found:

1. ep03.md epochAnnotation: 2242-12-12～2242-12-17 → should be 2241-12-09～2241-12-15
2. ep05.md epochAnnotation (2 instances): 2242-12-19～2242-12-28 → should be 2241-12-17～2242-01-07
3. cross-episode.md table:episode rows for EP3/EP4/EP5: wrong year (2242 instead of 2241) and wrong specific dates

Root cause

When episodes were migrated from JSON to MDX (Tasks 186-187), the update-diagram-angles script began skipping MDX files. The wrong epoch annotations were never corrected. The table dates in cross-episode.md are manually maintained and were likely a copy error.

Plan

1. Fix ep03.md epochAnnotation
2. Fix ep05.md epochAnnotation (2 instances)
3. Fix cross-episode.md table:episode dates for EP3/EP4/EP5
4. Add a consistency test that validates report epoch dates against computed timeline
5. All tests pass

Files

• reports/data/episodes/ep03.md
• reports/data/episodes/ep05.md
• reports/data/summary/cross-episode.md
• ts/src/report-data-validation.test.ts (new test)