A runner root under HERMES_HOME/cache made conftest relocate every basetemp out of the live
Hermes home into ~/hermes-pytest-basetemp-*: deeper paths pushed AF_UNIX test sockets past
sun_path, and a profile home under $HOME renders as ~/… (which one test compared verbatim).
The root now sits in $XDG_CACHE_HOME/hermes-pytest (disk-backed, outside the Hermes home,
as short as the old /tmp root) and the test asserts the displayed form.
get_real_home()'s tempfile fallback raised RuntimeError on Windows when a child env carried
no HOME/USERPROFILE; it falls back to the old literal instead of crashing env construction.
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