Keep live docs promotion qualification out of customer campaign metrics

[rmcdaniel]

Problem

The live documentation deployment qualifier at main@a12df54ee106b82c1b8732fbb47636b6949b7040 verifies all six Cloud promotion placements by sending the same impression and click payloads used for real visitors. Those accepted requests are aggregated as customer campaign activity, so every deployment qualification adds synthetic demand to the promotion totals it is meant to validate.

The public receiver already supports a bounded non-aggregating qualification event. The docs qualifier confirms the exact deployed candidate bundle before browser checks, but its live mode still emits and explicitly asserts organic event names.

Acceptance criteria

• After exact deployed-candidate matching, live/post-deploy qualification uses the receiver's non-aggregating qualification path and does not increment customer impression or click aggregates.
• Local or staged browser qualification continues exercising one real impression and one real click per placement, including navigation-safe keepalive transport.
• Live qualification still blocks on origin/CORS errors, unfinished or failed requests, non-204 responses, console/page/HTTP errors, destination failures, unexpected payload fields, or privacy regressions.
• Focused tests fail if live mode emits aggregating event names or if local/staged mode stops exercising real impression and click behavior.
• Reports clearly distinguish non-aggregating live qualification evidence from customer-event evidence while preserving source allowlists and the no-credentials/no-referrer boundary.

Delete when

Delete when a deployed six-placement qualification run is bound to the exact candidate, passes the full browser transport contract, and demonstrably adds no rows to customer impression/click aggregates.