Process completed with exit code 1.

PR #18868 tells GitHub to close a card its own sentence says it is not closing: body carries `closes #18551` in a sentence that reads as NOT closing it — "Arm **(b)** (a lint pairing arm) is **not** in this PR and is **not** dropped: the dispatching seat files it as its own card, which is why this PR closes #18551". GitHub's closing-keyword parser matches the keyword plus the number and ignores the surrounding prose entirely, negations included, so merging this closes #18551 and the sentence written to prevent that is what performs it. The measured specimen (PR #10241, "Filed, not fixed: #10240") closed a genuine unfixed card two seconds after merge, and a closed card reads as finished. Reword so no closing keyword sits next to that number — "#18551 is not addressed here" / "out of scope: #18551" / "#18551 remains open" — or put the keyword in backticks.