Strips a markdown fence so a fenced-but-otherwise-correct envelope still counts as parsed.
Fencing is a formatting habit, not a decision error. Counting it as malformed would inflate the
exact metric this harness exists to measure honestly — and MJ's own loop parser tolerates it, so
scoring it as a failure would also diverge from what production actually does.
Strips a markdown fence so a fenced-but-otherwise-correct envelope still counts as parsed.
Fencing is a formatting habit, not a decision error. Counting it as malformed would inflate the exact metric this harness exists to measure honestly — and MJ's own loop parser tolerates it, so scoring it as a failure would also diverge from what production actually does.