GH#740: bd doctor --fix was auto-removing child→parent dependencies,
calling them an 'anti-pattern'. While these often indicate modeling
mistakes (deadlock), they may be intentional in some workflows.
Changes:
- Add --fix-child-parent flag (required to remove child→parent deps)
- Remove ChildParentDependencies from default --fix set
- Update warning message to reference new flag
- Update comments to reflect more nuanced understanding
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>