fix: use SUDO_USER for docker group to get the invoking user not root

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

scripts/check_deps.sh

@@ -46,11 +46,13 @@ if ! docker compose version >/dev/null 2>&1 && ! command -v docker-compose >/dev
 fi
 echo "  [ok] docker-compose"
 
-# Ensure current user is in docker group
-if ! id | grep -q '(docker)'; then
-    echo "  Adding $(id -un) to docker group..."
-    usermod -aG docker "$(id -un)"
+# Ensure the invoking user is in the docker group (use SUDO_USER if available)
+TARGET_USER="${SUDO_USER:-$(id -un)}"
+if ! groups "$TARGET_USER" 2>/dev/null | grep -q '\bdocker\b'; then
+    echo "  Adding $TARGET_USER to docker group..."
+    usermod -aG docker "$TARGET_USER"
     echo "  NOTE: Log out and back in (or run 'newgrp docker') for docker group to take effect."
 fi
+echo "  [ok] docker group ($TARGET_USER)"
 
 echo "=== All dependencies OK ==="