v3: fix -autofree codegen - #28159
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v -autofreeemitted C that no compiler accepts: drop lists handed to the wrong block (naming variables not in scope), interface dispatch calling an unmangled symbol, destructors for functions dead-code elimination had removed, and no destructor at all for programs whose body is only literal prints.Fixes the transform and cgen causes, roots the IError destructors markused was dropping, narrows destructor emission to live functions, and adds a program-shape matrix plus a macOS CI
hello_worldbuild so the class is covered.