List Publications

A keyset-paginated page of template publications (TOS-3280).

next_cursor is None exactly when no older rows remain; pass it back as cursor for the next page. A non-None value IS the truncation signal - there is no separate truncated flag. This endpoint's default scope='community' is the worst-offending unbounded collection in the audit: it returns every publicly published template platform-wide, so the result grows with the marketplace, not with the caller.