Run Qwen235 profilers from Frontier source

runs/frontier-fidelity-envelope-v1/run_qwen235_v020_profiles.sh

@@ -20,6 +20,9 @@ nvidia-smi --query-gpu=index,memory.used --format=csv,noheader,nounits \
   | awk '$2 > 16 {exit 1}'
 git -C "${FRONTIER_SOURCE}" rev-parse HEAD > "${OUTPUT_ROOT}/provenance/frontier.commit"
 "${VENV_ROOT}/bin/vllm" --version > "${OUTPUT_ROOT}/provenance/vllm.version"
+# Frontier's model-config loader resolves data/config/models from the current
+# source checkout, so all profiling entrypoints must run from this directory.
+cd "${FRONTIER_SOURCE}"
 
 common_profile() {
   local gpu="$1" method="$2" root="$3"