chore(ci): show full test summary in CI output

- update Zig test command to include --summary all flag
- improve visibility of test results in GitHub Actions logs

Author: jinzhongjia

.github/workflows/ci.yml

@@ -25,4 +25,4 @@ jobs:
               with:
                   fetch-depth: 0
             - name: Build and test with Zig
-              run: zig build test
+              run: zig build test --summary all