Hostile sibling frame
This allowed parent embeds the chat widget and a frame from a different origin
(engagr-widget-hostile-test.pages.dev). The hostile frame repeatedly posts
forged engagr:campaignContext (consent granted, hostile UTM/click IDs) into
every sibling frame and into this page. Default parent consent is denied;
add ?consent=granted&utm_source=harness-parent to prove hostile values
cannot replace the real parent's attribution either.
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