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The C library layer declares the C environment it presents, the engine realises and checks it #1480

Job	Run time
e2e suite (macOS ARM64, self-host, macos-15)	16m 36s
e2e suite (macOS ARM64, self-host, xcode-27)	2m 49s
e2e suite (macOS ARM64, self-host, xcode-27)	2m 35s
e2e suite (macOS ARM64, self-host, macos-15)	16m 36s
e2e suite (macOS ARM64, self-host, xcode-27)	2m 34s
e2e suite (macOS ARM64, self-host, macos-15)	16m 36s
	57m 46s