Adds llm select options and descriptions

scripts/run-entire-copilot-migration.sh

@@ -2,6 +2,7 @@
 set -euo pipefail
 
 PROJECT_DIR="${1:-qt5-before/qt5-legacy-migration-benchmark}"
+COPILOT_MODEL="${2:-qwen3.5-397b-a17b}"
 
 need_cmd() {
   command -v "$1" >/dev/null 2>&1 || {
@@ -30,6 +31,7 @@ fi
 
 echo "Repo root: $REPO_ROOT"
 echo "Legacy project: $PROJECT_DIR"
+echo "Copilot model: $COPILOT_MODEL"
 
 entire agent add copilot-cli
 entire status
@@ -72,7 +74,7 @@ Requirements:
 - Briefly explain each migration change
 PROMPT
 
-copilot
+copilot --model "${COPILOT_MODEL}"
 
 echo
 echo "== Git status after Copilot session =="