chore: bundle xlings 2026.8.27.5, and release 2026.8.28.1 #1162

Job	Run time
hermetic e2e (no host toolchain, container)	5m 50s
bare-metal e2e (riscv64-none-elf, qemu)	6m 50s
e2e 1/2 (linux x86_64, self-host)	12m 41s
e2e 2/2 (linux x86_64, self-host)	14m 24s
	39m 45s

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