Tests: Drop the GPU kernel-image skip and define one packet test marker Restore test/gpu_common.h: a binary without a kernel image for the device fails again instead of exiting 77, which CI counts as a pass. Packet test kernels and operations share EIGEN_PACKET_TEST_FUNC from packetmath_test_shared.h. Correct the comments on the rsqrt double budget under MSVC, the uint8_t operand range and the alignment the aligned device loads rely on, and drop an unused template parameter. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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