fix: check FULL_CONFIG string instead of VERIFIER_MODE for artifact detection

VERIFIER_MODE is set by config_to_mcp_type() but that function runs inside
$() subshells at lines 151-152, so the global never propagates to the parent
shell. Check FULL_CONFIG directly instead.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: sjarmak

configs/run_selected_tasks.sh

@@ -376,9 +376,11 @@ _launch_task_pair() {
     local _mcp_temp_dir=""
     local _bl_temp_dir=""
 
-    # Determine which Dockerfile variant to use for each config
+    # Determine which Dockerfile variant to use for each config.
+    # Note: cannot rely on VERIFIER_MODE because config_to_mcp_type runs in $()
+    # subshells (lines 151-152), so its side-effect globals don't propagate.
     local _is_artifact=false
-    [[ "$VERIFIER_MODE" == "artifact" ]] && _is_artifact=true
+    [[ "$FULL_CONFIG" == *artifact* ]] && _is_artifact=true
 
     # Launch baseline config
     if [ "$RUN_BASELINE" = true ]; then