Safe DOCX posture
w:tcBorders cell border collection
Declared cell borders emit as a w:tcBorders collection in the
CT_TcBorders sequence with explicit size/space/color per edge, sitting
between w:vMerge and w:shd in the cell-property order.
Schema declarations
Bounded evidence
No bounded source, test, or formal-evidence path is attached to this section entry. That absence is preserved rather than inferred away.