- M3: Replace blacklist-based valid_return_path? with whitelist of known app
route prefixes, plus URI decoding to prevent %2f encoding bypasses
- M6: Replace full-org device/link load in get_node_detail with targeted
join query filtering by discovered node fields
- M7: Add partial unique index on (organization_id, email) for pending
invitations (WHERE accepted_at IS NULL)
- M12: Add on_mount superuser verification to all 7 admin LiveViews for
defense-in-depth