fix: Add missing return statement in mark_test_failed

Fixes mypy error: Missing return statement [return]

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: cfsmp3

mod_ci/controllers.py

@@ -541,6 +541,8 @@ def mark_test_failed(db, test, repository, message: str) -> bool:
         log.critical(f"Test {test.id}: BOTH database and GitHub updates failed - "
                      f"test is in inconsistent state!")
 
+    return db_success and github_success
+
 
 def _diagnose_missing_artifact(repository, commit_sha: str, platform, log) -> str:
     """