The control test only added one thing over the first new test: a quick()
deletion check for untracked scratch in a git-init'ed HERMES_HOME. It also
passed on base, so it pinned no new behaviour. Save both entries in the
first test's quick() call and assert the tracked file survives while the
scratch beside it is deleted, then drop the control. The stack now adds
one test, and that test is still red on base.
Update test_scratch_outside_git_trees_still_cleaned's docstring. It said
only a .git below HERMES_HOME marks a file git-owned, which stopped being
true once an enclosing repo that tracks the file counts too.
6e8a0a0f99