`IntegrationsSettings/index.tsx` has carried the rule since email was extracted
on 2026-08-18: "A plugin contributes panels, not settings sections, so it now
lives inside the email workspace itself."
the atelier extraction brief said the opposite, and the brief was mine and
wrong. sonnet found the contradiction, recorded it in BLOCKERS.md under a
heading that says "against a direct precedent", and followed the instruction
anyway — which is what it was told to do. so the wrong call got implemented
carefully rather than caught.
settings in the platform mean the plugin is not self-contained: it cannot be
configured on an older platform, and uninstalling leaves a dead section in the
settings screen for someone to delete by hand. neither is true of a panel.
the section, its import and its now-unused icon are gone from here. the screen
is `plugins/atelier/web/Providers/` and a fourth panel.
