FOLLOW-UP: Add test for Windows line endings in frontmatter detection (from PR #145)

[adnaan]

Context

This follow-up task was identified during the review of PR #145.

Source PR: #145
PR Title: feat: auto-interactive markdown checkboxes
Suggested by: @claude-bot
Priority: Low

Task Description

The frontmatterPattern regex in auto_tasks.go uses \A---\n which requires exactly \n newlines. Files with \r\n line endings (Windows) won't match, causing the frontmatter to be processed as content and potentially breaking task list detection.

Tasks:

1. Add unit test with \r\n line endings to confirm the behavior
2. If it fails, update the regex to \A---\r?\n(.+?)\r?\n---\r?\n
3. Consider if this also affects other regex patterns in the file

Original Comment

The frontmatterPattern uses \A---\n which requires exactly one newline. Files with \r\n line endings (Windows) or ---\r\n won't match.

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This issue was automatically created by prmonitor from PR review comments.