New pages take max(instance default, parent level); moving a subtree
under a higher-classified parent raises every member below that level.
No move-like path (reposition, trash-promote, purge-promote) lowers a
level as a side effect — pinned by test. Raising is ordinary editorial
work; lowering requires the dedicated capability canLowerClassification
(pond-wide Pond Admin) in the central permission model. Both directions
are audited (page.classification_raised/_lowered, catalogue v1.1) with
old value, new value, actor and page.
Co-Authored-By: Claude Fable 5 (1M context) <noreply@anthropic.com>
