rhythm-killer

Fixes two sentence-rhythm tells that mark prose as AI-generated. Two targets behind one skill, picked via the --target arg. fragment-chain (three or more short sentences back-to-back) and uniform-length (two or more consecutive sentences within ~2 words of each other, especially with parallel structure). Use when the user says "reads like AI," "too choppy," "same length sentences back to back," "staccato,"…