chore: bump version to 2026.7.29.2 #602

Job	Run time
integration: mcpp builds & runs xlings	6m 48s
toolchain: musl + llvm	6m 0s
toolchain: gcc (cold self-host)	5m 24s
build + unit tests (linux x86_64, self-host)	5m 4s
	23m 16s

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