Reported: no Tools section in Settings. The setting existed in the database and
had no page, which from a person's side is indistinguishable from the feature
not existing.
get_settings_defaults SEEDS a setting. get_settings_cards (ADR-010) is what puts
it in the rail. Declaring only the first is a silent half-feature: nothing fails,
no test notices, and the switch is unreachable.
The page states the cost where the DECISION is made rather than in a document
nobody opens - turn it on and it says a guest-created link records no creator,
so the audit trail can say when and from where but never who.
Admin-only, like every other settings page, because this one decides whether an
unauthenticated caller may write to the site.
Also caught while wiring it: the card asked for a 'shield' icon, which is not in
the settings iconMap, so it would have rendered the fallback puzzle piece - the
glyph that reads as "nobody chose this". Uses wrench, matching Tech Tools.
The row still comes from `flask plugin upgrade-all`; the card appears either
way, and without the row the page loads empty.
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