LeafCoverageReport carries a private escapeAdocCell duplicating Main’s

LeafCoverageReport declares a private escapeAdocCell that is a character-for-character duplicate of Main’s: both escape a pipe for AsciiDoc table-cell context and nothing else. Two copies of one escaping fact means the next cell-escaping rule (or the inert-span emission R587 introduces around the same emitters) lands in one and silently not the other. Fold them into one shared helper in roadmap-tool; natural to co-locate with the R587 `InertSpans unit if that item has landed, but not dependent on it. Surfaced by the R587 Spec review, which flagged it as adjacent new scope rather than part of that item.