Find Meta spend that bought nothing

Finds ad sets that spent money and produced no results in the window, and ad sets whose cost per result is far above the account's own average. Everything still in the learning phase is listed separately and explicitly excluded from the "pause it" recommendation. Use when: the user asks where their Meta budget is leaking, or before any budget reallocation. Do not use as a pause list without reading the rule it prints — an ad set with no results may simply be new, or may be on an objective that records no conversions at all. Returns three groups: wasted (spend above the threshold, zero results), expensive (cost per result more than the multiplier above the account average), and learning (spending but not yet out of the learning phase — leave these alone). The rule is stated in the output so the user can disagree with it. If nothing crosses the threshold, say the account looks clean rather than inventing a finding.