Conversion Signal QA Pre-flight QA of the measurement plumbing behind paid ads — conversion-event firing, UTM hygiene, cross-platform dedup rules, attribution-window alignment, and offline/iOS-ATT modeled-gap flags — delivered as a tracking pre-flight checklist plus a UTM/event-spec builder. Scope line: this skill BUILDS and FIXES the signal pre-flight so the data is trustworthy; it does NOT score the ROAS / vetoes — ad-account-auditor judges those as scored red lines. It is the / prerequisite, not the verdict. It is also not the standing monthly de-dup / incrementality reconciliation — that…