netify_check() validates only class membership. validate_netify()
goes further: it verifies that the netify's internal pieces still
agree with each other after any user-side surgery (e.g., manually
edited attr(., "nodal_data"), subset() followed by an attribute
overwrite, etc.). Use this when you've hand-modified a netlet and
want to confirm it's still well-formed before passing to
to_statnet() / to_amen() / plot().
Value
Invisibly returns a list with one logical per check (TRUE
= passed). The function cli::cli_abort()s on any failure unless
verbose = TRUE, in which case failures are reported per-check
and the function returns invisibly with the full failure list.