Enhance CI workflow for multi-OS and architecture builds

[SF-Zhou]

Updated the CI workflow to support multiple OS and architectures using a matrix strategy.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (415adb1) to head (0896af5).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #32   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            2         2           
  Lines         1533      1533           
=========================================
  Hits          1533      1533           

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[Copilot]

Pull request overview

Updates the Rust CI workflow to run the build job on multiple operating systems (and nominally multiple architectures) via a GitHub Actions matrix.

Changes:

• Replaced fixed runs-on: ubuntu-latest with runs-on: ${{ matrix.os }}.
• Added a matrix with OS/target combinations for Linux, macOS, and Windows.

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[Copilot]

windows-arm64 is configured to run on windows-latest, which is an x86_64 runner. If the intent is to validate ARM64 Windows, this will not do so unless you add an explicit cross-compilation setup (and potentially skip running tests/coverage for that target). Consider removing this entry or switching to a supported approach for ARM64 validation (cross build only, or a self-hosted ARM64 runner).

[Copilot]

linux-arm64 is set to run on ubuntu-latest (x86_64). Without additional cross-compilation/QEMU setup (and without using ${{ matrix.target }} in the steps), this does not actually validate an ARM64 Linux build. Either add the required cross toolchain/configuration and a cargo build --target step, or drop this matrix entry to avoid misleading CI coverage.