Fix mcpchecker verify subcommand for v0.0.18

mcpchecker renamed the subcommand from `verify` to `result verify`.
Cherry-pick the fix from main.

Signed-off-by: Jason Madigan <jason@jasonmadigan.com>

Author: jasonmadigan

.github/workflows/gevals.yaml

@@ -129,7 +129,7 @@ jobs:
             echo "No results file found — mcpchecker may have crashed"
             exit 1
           fi
-          mcpchecker verify --task 1.0 --assertion 1.0 "$RESULTS_FILE"
+          mcpchecker result verify "$RESULTS_FILE" --task 1.0 --assertion 1.0
 
       - name: Upload Evaluation Results
         if: always()