An article's searchable text lives in three places: its title, its keywords,
and the name of its topic. Nobody typing a search knows or cares which word
came from which, so 'CMM Community' means "the article tagged community, under
the CMM topic". Both search paths returned nothing for it.
The plugin's own listing, which is what the KB page calls, built a single
ilike('%CMM Community%'). That needs the whole phrase contiguous in ONE field,
and no article has it: 'CMM' is only in the topic's name, 'Community' only in
the keywords. Global search already split the query into words but only ever
looked at title and keywords, so a word that only the topic could satisfy
failed there too - the same bug wearing a different face.
Every word must now be found somewhere across all three fields, in any order.
_word_match gains an `extra` hook for a word that a RELATED row satisfies
rather than a column of this table, which is how the topic joins in without
colliding with the sort=='topic' join.
The retired-topic rule is unchanged and pinned on both paths: matching more
words is not a way past it.
Verified against the 235-article dev library, where all three of these
returned nothing before: 'Fieldglass Jefferson' (title word plus topic word),
'outage notification' (two keywords, not adjacent), 'compucom Jefferson'.
The same phrase-only pattern is repeated in about ten other list endpoints
(computers, machines, printers, network, printedparts, measuringtools, usb,
notifications). Left alone here - fixing them properly means promoting the
word-match helper onto the shopdb.api contract surface rather than copying it
per plugin, which is a contract bump.
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