Drive-by: update adapter test + remove dead vars (pre-existing CI bre… #2

Job	Run time
build-and-test (ubuntu-latest, clang, clang-18, clang++-18)	48s
build-and-test (ubuntu-latest, gcc, gcc-13, g++-13)	45s
build-and-test (macos-latest, default)	45s
build-and-test (ubuntu-latest, default)	44s
build-and-test (windows-latest, default)	1m 7s
	4m 9s

Provide feedback