Two behavioral fixes from the review: - modeSummary's backward scan now stops at the most recent user message. With the dwarf ratio rejecting the current turn's 1x-3x answer, the old unbounded scan could walk into WithHistory content and resurrect a stale answer to a DIFFERENT question — strictly worse than keeping the closer (opus, correctness). Other modes keep their historical unbounded scan. - A terminal matching BOTH the ack shape and a back-reference is now classified back-ref: it carries no answer content, so the looser bar is the right one (opus, error-handling). Plus the nits: summaryCloserRe assembled from named fragments, the leading marker class gains '+' (parity with citationLabelRe), verb-first form takes 'all the', dwarf ratio hoisted into one named local, and the 151-vs-153 char/byte comment inaccuracy corrected. Co-Authored-By: Claude Fable 5 <[email protected]>