A bare `plugin` line in .gitignore matched every <vm>/cmd/plugin DIRECTORY, so
`git add` inside one printed a hint and staged nothing. This file was written
and passing and was not in the repository. Another lane anchored the pattern to
/plugin; this is the file that was stranded behind it.
Work that is written, green, and invisible is the worst of the three states: it
looks done to whoever wrote it and does not exist to anyone else.