QUnit classical shadows (debug, 2)

Blame @WrathfulSpatula: classical shadows should only be applied in QUnit::ApplyBuffer() with the basis "frozen." (I swear this is the last time I'm iterating a round of releases today, with apologies for the notification noise.)

Full Changelog: vm6502q.v9.12.17...vm6502q.v9.12.v18

sha1sum results:
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e8347704241945a25f97de2fa67d5da75fd87607 libqrack-macosx_15_0_arm64.zip
743b1374f87445b4630f11908470211fac9a7b02 libqrack-manylinux2014_x86_64.zip
4bc288400763693c1021cc86892c0483c4d68035 libqrack-manylinux_2_35_x86_64.zip
a5d1de55efa35ccad651fd02eb56c085866f0dcf libqrack-manylinux_2_39_x86_64.zip
673d3639b084579b4eff281202a2d678ba5d5320 libqrack-win-amd64.zip