Task 435: Add Tests for dag-task-sync.ts Functions

Status: DONE

Summary

Add tests for the two exported functions in dag-task-sync.ts: parseTaskFile and syncTasksIntoDag. Both are pure functions with well-defined interfaces.

Rationale

• parseTaskFile has regex-based parsing logic for task status, dependencies, and tags
• syncTasksIntoDag has DAG state mutation logic that should be validated
• Both functions are exported and untested