test(cli): isolate the suite from the real ~/.config/lectio

The ref/rand cli tests assume English book abbreviations ("Jn 3:16"), but
with no LECTIO_CONFIG set they read the developer's real user config. On a
machine whose config has ui_language = pl (sigla_style = auto -> Polish
dialect), "Jn" is not a valid abbreviation and TestRefSingle,
TestRefEnglishDialect, TestRefRejectsPolishAbbrevInEnglish, TestRefCompare
and TestRandVerse fail -- while passing on a clean CI.

Add a package TestMain that points LECTIO_CONFIG at a throwaway temp path,
forcing built-in defaults for every cli test and guaranteeing the suite
never reads or writes the real user config. Suite now green on a Polish
config too.

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