DF-4227 PoC environment (QEMU audit guest)
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uname -a: DragonFly dfbsd 6.5-DEVELOPMENT DragonFly 6.5-DEVELOPMENT #0: Thu Jul  2 06:02:54 UTC 2026  root@dfbsd:/usr/obj/usr/src/sys/X86_64_GENERIC  x86_64
compiler: cc 8.3 [DragonFly] Release/2019-02-22
cyapa form factor: loadable KMOD (sys/dev/smbus/cyapa/Makefile), not in kernel
hardware: QEMU (no SMBus controller, no Cypress APA trackpad)
module: cyapa.ko builds clean (make), loads, sysctls register, no attach,
        /dev/cyapa* never created (no responding SMBus address 0x67).