ad-account-diagnosticlisted

# Account Diagnostic Find the root cause of an underperforming ad account before anyone touches it. The whole discipline is refusing the reflex fix: an account that "stopped working" has at least seven candidate failure layers, and the most common responses - raise the budget, swap the creative, blame the algorithm - each treat one unproven hypothesis as a verdict. This skill works the layers in a fixed order, measurement first, because every downstream number is read off the conversion signal: as Adspirer puts it, the checklist is "ordered the way an experienced PPC manager actually works it: measurement first (because every other number is wrong if tracking is broken)". It decomposes the metric chain to localise the failing link before naming a cause, compares the account against its own history rather than industry benchmarks, and refuses to issue any verdict the data cannot support. The output is a diagnosis with confidence, evidence, and a prioritised handoff plan - never an executed change. This skill stops at the account boundary; everything past the click hands off elsewhere, and this skill never becomes a budget skill - it exists precisely because "increase the budget" is the wrong default. - **Past the click** (message match, page friction, the page fix list): `mbfinotti/advertising-skills@paid-landing-page-audit`. This skill only flags "the evidence points downstream of the click" and hands off. - **Fragmentation verdict** (merge plan): `mbfinotti/advertising-s