Part of: Upgrade mode regroups every existing heading and the diff is hard to review (E4.3). ## Task Add `--no-regroup` ## Subtasks - [ ] Headings and body untouched - [ ] Only the marker blocks change ## Definition of done - [ ] Tests added or updated and CI green - [ ] Docs updated when the command surface or output changes - [ ] No private registry data, local paths or private repository names in fixtures or docs
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