test: exercise packaged cargo new through the world builder

host/tests/packaged-builder.nu

@@ -9,10 +9,9 @@ def main [host: path = 'result/bin/sausage'] {
     print --no-newline $initialized.stdout
     print --stderr --no-newline $initialized.stderr
     if $initialized.exit_code != 0 { error make {msg: 'packaged host init failed'} }
-    # Cargo new is not available until T86. This dependency-free crate tests the same builder.
     let script = r#'set -e
-mkdir -p /src/packaged-probe/src
-printf '[package]\nname = "packaged-probe"\nversion = "0.1.0"\nedition = "2024"\n' > /src/packaged-probe/Cargo.toml
+cd /src
+cargo new packaged-probe --vcs none
 printf 'fn main() { println!("packaged builder OK"); }\n' > /src/packaged-probe/src/main.rs
 cd /src/packaged-probe
 cargo build --release