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Living Weights on Qwen4 dense, step 1: the QSA backward on the host, against binary64 (#1804) - #2021
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Check fixed-selection Q/K/V and output-gate pullbacks against an independent binary64 loss, including GQA and sparse causal tails. Document the CUDA and Metal pocket/trainer plan and the unqualified device forward cuts. Refs #1804.
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Part of #1804. This is host maths only, not yet a learner: the fixed-selection QSA adjoints for dQ, dK and dV, and the output-gate pullback, checked against an independent binary64 reference. It adds 7 tests and a
test-qwen4-qsa-backward-hoststep, plus a plan recipe for the next steps. Nothing served changes. Reviewed independently twice.