Safe DOCX posture
w:vMerge vertical cell merge
Merge starts emit w:vMerge w:val="restart"; continuations emit the
bare element form Word itself writes. Validation requires each
continuation to sit at exactly the grid position and span of a merge cell
in the previous row.
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.