fix(ci): stabilize Rust release graph actions

Summary

• Main release CI was still failing after the first fix: Linux ARM release jobs could not find ld while compiling host Rust actions, and Windows release jobs malformed --cfg feature="..." for cargo dependency builds.
• Thread the sanitized C tool PATH into Unix host rustc compile actions and build-script rustc actions, so GCC can find ld without forwarding the full host environment into every compile action.
• On Windows hosts, write Rust feature cfg flags to a small rustc response file and pass @rustc-features.rsp, avoiding nested quote parsing in the Windows process command line while keeping the existing direct argv path on other hosts.
• Add focused prelude tests for the Linux linker path regression and the Windows feature cfg response-file path. This keeps the fix in the Rust target-kind prelude instead of changing the generic action runner.

Testing

• mise exec -- cargo test -p once-frontend --test prelude
• mise exec -- cargo fmt --all -- --check
• git diff --check

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