This test file was added back temporarily during the post-implement
cleanup so that its removal could be recorded explicitly as part of
the production hardening merge.
It was originally scaffolding from the implement session and is no
longer needed (the minimal Validate + GetDefaultConfig support was
added directly to config.go instead).
This file was previously ignored as stray. Adding it now so that
its removal can be part of the upcoming production hardening merge
instead of being a silent untracked file.
It will be deleted in a follow-up commit.