Record five keyboard-driven OneNote joins covering differing paragraph styles, tagged empty text, right-side tags and children on both sides. Preserve native identity, hierarchy, tag-transfer and metadata observations in public fixtures.

The native document oracle passes six pages before and after joining, and all characters plus 2,180 style comparisons survive. The complete Python lane passes 129 tests; all owned VMs were removed.

Assisted-by: gpt-6-astra