Safe DOCX posture
Inserted paragraph mark (w:ins under w:pPr/w:rPr)
ECMA-376 Part 1 §17.13.5.20 defines w:ins inside w:pPr/w:rPr as a tracked
insertion of the *paragraph mark*, not of the paragraph's contents. Rejecting
the revision removes the inserted paragraph break, so the paragraph's
surviving content merges into the following paragraph; the contents disappear
only where they carry their own run-level w:ins wrappers. safe-docx's reject
paths implement this merge in
packages/docx-core/src/primitives/reject_changes.ts and
packages/docx-compare/src/baselines/atomizer/trackChangesAcceptorAst.ts.