[excerpts — full log was 54,491 lines in guest /root/poc/build.log; decisive lines kept verbatim]
...
35396:--- vfs_quota.o ---
35397:cc -c -O2 -pipe ... -std=gnu11 -g -nostdinc ... -D_KERNEL ... /usr/src/sys/kern/vfs_quota.c -Werror
...
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>>> Kernel build for X86_64_GENERIC completed on Thu Sep  3 14:01:36 UTC 2026
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RC=0
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>>> Kernel install for X86_64_GENERIC completed on Thu Sep  3 14:05:38 UTC 2026
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INSTALL_RC=0
(/usr/src/sys/kern/vfs_quota.c = DF-2922 fix applied, md5 0bb5851469f13e903afdd873aaadf267,
 vs stock a2c1da7b3199798be95a4adbbf342118; compiled with -Werror -> clean)