ZstdNet bundles libzstd for every RID, so nothing needs a system zstd.
Verified: the 15 ManagedArchive round-trip tests pass in a container
with no zstd package installed, and the build deploys
runtimes/<rid>/native/libzstd.* for linux-x64, linux-arm64, osx-x64,
osx-arm64 and win. The apt/dnf "zstd" package is the CLI tool, which
nothing shells out to.
Also aligns the Fedora line to libicu rather than libicu-devel, matching
the README and NativeLibraryChecker.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
a4104d0768