+>>>> robust for future plugin writing.
+>>>>
+>>>> **addendum**: if the new phase state is used to create warnings/errors
+>>>> about improper ikiwiki api use of plugins (which is something i'd
+>>>> advocate), that should likewise warn if `add_link` actually adds a link in
+>>>> the render phase. such a warning would have helped spotting the
+>>>> link-related [[template evaluation oddities]] earlier. --[[chrysn]]