fix: propagate unit test exit codes in CI workflow

Add --exit-code-from flag to docker compose command to ensure
unit test failures properly fail the GitHub Actions job.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: tconley1428

.github/workflows/ci.yml

@@ -25,7 +25,7 @@ jobs:
 
     - name: Run unit tests
       run: |
-        docker compose -f ./docker/github/docker-compose.yaml up unit-test
+        docker compose -f ./docker/github/docker-compose.yaml up --exit-code-from unit-test unit-test
 
   code_format:
     name:  Code format