The "Category Code" field had no TableRelation at all, so the good
subscriber's RemoveTableRelation call targeted metadata that never
existed - a no-op. Added a real TableRelation to "Sample Setup" on
that field (the one known exception to exclude) and a second,
ordinary self-referencing relation ("Parent No." -> "Sample
Header"."No.") with no exception. The good fixture now removes only
the first; the bad fixture's table-wide removal (field/related
table/field all 0) now demonstrably also strips the second, showing
the actual anti-pattern instead of removing nothing meaningful.
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