What changed

• Normalize Bash/MSYS and Windows path formats in the worktree redirect tests before comparing paths.
• Move extract-structure result mapping into a shebang-free module so unit tests do not import the CLI entrypoint directly.
• Keep the existing extract-structure CLI buildResult export as a re-export for compatibility.

Testing

• pnpm lint
• pnpm --filter @understand-anything/core build
• pnpm --filter @understand-anything/skill build
• pnpm --filter @understand-anything/core test
• pnpm test
• python -m unittest tests.skill.understand.test_merge_batch_graphs -v