Task 399: Fix Broken Anchor References to Cross-Episode Sections

Status: DONE

Summary

Several report files reference cross-episode.html#相対論的効果の評価--光速の1-25での補正量 but the actual slugified anchor ID is 相対論的効果の評価-光速の1〜25での補正量 (single dash, wave dash 〜 not hyphen). Fix all mismatched anchor references.

Rationale

• Broken anchor links silently fail (page loads but doesn't scroll to section)
• CLAUDE.md: "Source citations must be clickable links"