feat: Phase 4 doc spans + round-trip equivalence tests#122

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avrabe merged 2 commits intomainfrom

feat/phase4-roundtrip

Apr 3, 2026

Commits on Apr 3, 2026

feat(doc): byte-offset span tracking for [[ID]] refs and headings (Phase 4)
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test: comprehensive rowan parser round-trip and equivalence tests
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