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One C++ runtime per process, the graph and pack facts, bounded offline-aware planning: #646 to #649 (2026.9.16.1) #1965

Job	Run time
toolchain: gcc (cold self-host)	11m 51s
toolchain: musl + llvm	11m 42s
integration: mcpp builds & runs xlings	9m 41s
examples: the curriculum builds	8m 11s
build + unit tests (linux x86_64, self-host)	17m 29s
	58m 54s