Reported directly to devteam: when selecting an item to engrave
with, "getobj refactor"'s stylus_ok() classified none-of-the-above
objects as not viable instead of allowing arbitrary things to
engrave in the dust or give specific can't-use-that messages like
for food. Make the suggested fix: change default result when
checking an inventory item for applicability from GETOBJ_EXCLUDE
to GETOBJ_DOWNPLAY.
Engrave feedback rather than getobj selection: splash of venom
isn't necessarily wizard mode-only so don't reject attempting to
engrave with it as using an illegal object. And remove the extra
question mark from its "poison pen" message.