fix(diagnostics): stop promising a remedy that does not work (2026.8.… #1037

Job	Run time
build + unit tests (linux x86_64, self-host)	11m 57s
toolchain: gcc (cold self-host)	7m 49s
integration: mcpp builds & runs xlings	8m 16s
toolchain: musl + llvm	8m 16s
	36m 18s

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