# Description
The `(version).build_os` variable inherits from `shadow_rs` `BUILD_OS`
which points to the OS on which the binary was built but does not
reflect the target if it was cross-compiled. We cross-compile several of
the targets for our binary releases. Thus the info in the banner was
misleading.
# User-Facing Changes
By changing to `build_target` the target triple is shown instead.
This is slightly more verbose but should also allow disambiguation
between the `musl` and `glibc` builds.

# Tests + Formatting
(-)
`std/core` is always loaded by Nushell during startup, and the
commands in it are always available. As such, it's renamed
`std/prelude`.
`scope modules` and `view files` now show `prelude` in place of
`core`.