The poller now reads GitHub's mergeable field alongside reviews and
checks. A CONFLICTING PR drops any approved-green verdict (as
changes-needed-by-you, not a CI failure), wears an alarm-coloured
conflicts chip in the card's footer row, and narrates the flip in the
ticker. GitHub computes mergeability lazily, so UNKNOWN keeps the
previous reading instead of flapping the chip.
The poll fold is now a pure function (_fold), so the verdict logic is
testable without gh.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
