Promotion cherry-picks, which gives the commit a new sha on main. wj-status
compared by sha via main..wj, so after promoting ten commits it still listed all
ten as unpromoted - and would have invited promoting the same work twice.
git cherry compares patch content instead and marks an already-present commit
with a leading '-'. When nothing is genuinely outstanding it now says so, counts
what has already landed, and shows how far the branch is BEHIND main with the
rebase to run. Behind was the state that mattered here and the tool could not
express it at all.
Scope: product
faace01f2d