test(node): the backslash-path test modelled the wrong platform

It asserted `Path(win_dir).as_posix() == "C:/Users/alice/Media"`, which is only
true where `Path` is a `WindowsPath`. On every other machine a backslash is an
ordinary filename character, `as_posix()` converts nothing, and the test failed
against correct code — so it has never passed on this suite's usual host, and
never guarded anything there. `PureWindowsPath` names the flavour and makes it
the same assertion on all three platforms.

The round trip also only ever proved that `as_posix()` produces a parseable
string, never that the config writer calls it — which is the defect, and one no
Linux machine can reproduce: the file is written, parsed and served correctly
here and fails on the operator's Windows box. A second test reads ops.py for
every f-string landing on the right of a TOML `path =` and requires
`as_posix()` in it. Weak evidence, and the only kind available for a platform
the suite does not run on; checked to fail with the call removed.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_011pvMdvLBG92jyhvD5pD6us

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