test_history_file_bad_compression and test_history_file_bad_json wrote to
a fixed /tmp/doesntmatter, which on the Windows runner is D:\tmp and does
not exist on a fresh machine. They passed only when the preceding
permission-error test had already run: mocking builtins.open there does not
stop the history setup from creating the file's parent directory, so that
test created D:\tmp as a side effect. Under xdist the order is not fixed,
and adding tests elsewhere shifted the schedule so both writers reached a
worker first and failed on every Windows job.

All three tests now use tmp_path, so none depends on a directory existing
or on another test having run. Each passes alone on a single worker.

Validation: 2587 passed, 6 skipped with coverage; make check, make test,
make docs-test and git diff --check passed.