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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) #1966

Job	Run time
examples: the curriculum builds	5m 27s
integration: mcpp builds & runs xlings	10m 9s
toolchain: musl + llvm	10m 9s
toolchain: gcc (cold self-host)	1m 35s
build + unit tests (linux x86_64, self-host)	10m 9s
	37m 29s