fix(ci): report test pass/fail status on PRs

The test workflow captured exit codes but never failed the job, so PR
checks always showed green even when tests failed. Exit with the
captured code in the summarize step so each suite properly reports
pass/fail. Not a required check, so failures remain non-blocking.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.github/workflows/test.yml

@@ -137,4 +137,5 @@ jobs:
             echo "### :x: ${{ matrix.suite }} suite failed (exit code ${{ steps.test.outputs.exit_code }})" >> "$GITHUB_STEP_SUMMARY"
             echo "" >> "$GITHUB_STEP_SUMMARY"
             echo "See the uploaded \`junit-${{ matrix.suite }}\` artifact for details." >> "$GITHUB_STEP_SUMMARY"
+            exit 1
           fi