Task 429: Add Tests for Untested build.ts Functions

Status: DONE

Summary

Add unit tests for parseADRFile and resolveDialogueReferences in build.ts — two exported functions with significant logic but zero test coverage.

Rationale

• parseADRFile is pure parsing logic (ADR markdown → structured data) — highly testable
• resolveDialogueReferences resolves dialogue line IDs in reports, produces warnings for broken references — conditional logic worth verifying
• Both are already exported, so no refactoring needed to test them