list_regressions

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What is measurably worse than it was, over the last `days` (default 30). Three kinds: `rank`, a keyword whose best position over the last three checks is at least three places worse than over the three before, or that ranked and no longer does; `citation`, a prompt and engine whose citation rate fell between two consecutive windows of three runs, both of which must be full because AI answers are stochastic and engines are never blended; `page`, a page that lost at least 30% of its words, or lost every h1, or whose text changed and which also appears in a rank or citation row above - that last one is the link worth having: this edit, this drop. Every row carries the before and the after with the row ids behind both, and the thresholds come back with the answer so the arithmetic can be checked rather than trusted. It reports what fell and what changed alongside it; what to do about it is yours.