Test asset_both filling for non-compact assets #6
Description
Add test coverage for asset_both filling magic transformation.
Verify that asset_both gets filled for assets with investment_method != 'compact' using asset_milestone rows with commission_year=milestone_year.
Reference: README magic transformations - 'Fills asset_both for asset.investment_method != "compact" using the rows of asset_milestone, repeating commission_year=milestone_year'
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Co-authored-by: Claude Code (claude-sonnet-4-20250514) noreply@anthropic.com