chore(release): 2026.8.19.1 #1142

Job	Run time
toolchain: gcc (cold self-host)	7m 48s
build + unit tests (linux x86_64, self-host)	11m 22s
integration: mcpp builds & runs xlings	6m 19s
toolchain: musl + llvm	8m 42s
	34m 11s

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