tag-count now reaches the shell via the environment, validated to 1-10
(an apostrophe in the raw interpolation could terminate quoting; above
~14 tags the expansion exceeds GitHub's 256-job matrix limit).
Result-chart cell ranking matches on the leading token: rendered
success/failure cells carry artifact links, so whole-cell indexOf
ranked them -1 and any skip in the map beat a real outcome.
README documents per-run cost, route slice sizes, the tag-count bound,
and a warning against running the GUI drivers outside a disposable VM.
a3e7d6a1c7