ci: add stable Windows CI job

[liuq19]

Summary

• Add a dedicated test-stable-windows job in .github/workflows/ci.yml.
• Run the existing ./scripts/test.sh on windows-latest to catch Windows-specific compile/test regressions.
• Keep existing Linux/ARM jobs unchanged.

Test plan

• Run cargo check locally.
• Verify the new Windows job passes in GitHub Actions.

[Copilot]

Pull request overview

Adds Windows coverage to the CI pipeline by introducing a dedicated stable Rust job on windows-latest, intended to catch Windows-specific compile/test regressions while leaving existing Linux/ARM jobs unchanged.

Changes:

• Add test-stable-windows job to run stable toolchain tests on windows-latest.
• Run the existing ./scripts/test.sh test script from the new Windows job.

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[Copilot]

On Windows runners, invoking the script as ./scripts/test.sh can fail if the executable bit isn't preserved by checkout (common on Windows), resulting in Permission denied. Prefer running it via the interpreter (e.g., bash ./scripts/test.sh) so the job doesn't rely on POSIX exec permissions.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 69.97%. Comparing base (adb31a1) to head (7314b69).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #216   +/-   ##
=======================================
  Coverage   69.97%   69.97%           
=======================================
  Files          42       42           
  Lines        9917     9917           
=======================================
  Hits         6939     6939           
  Misses       2978     2978           

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