The test.yml workflow's rust-fmt-check, rust-clippy, and rust-tests
jobs were missing libsodium-dev package installation. With the new
use-pkg-config feature enabled, pkg-config must be able to find
libsodium system libraries.
This resolves "libsodium not found via pkg-config" failures in the
test pipeline.
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
Explicitly adds libsodium-sys-stable dependency with use-pkg-config
feature to ensure builds use system libsodium via pkg-config instead
of attempting vendored builds.
Changes:
- Add direct dependency on libsodium-sys-stable with use-pkg-config feature
- Update Windows build to use pkg-config with cross-compilation support
- Remove manual SODIUM_* env vars that bypass pkg-config
This resolves "libsodium not found via pkg-config or vcpkg" build
failures on Linux and Windows CI targets.
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
