deploy.sh: pass -H to sudo so pip doesn't warn about user cache.

Without -H, sudo keeps HOME pointed at the invoking user, so pip running
as root tries to write to /home/<user>/.cache/pip and disables caching
with a warning. -H resets HOME to /root while -E preserves the rest.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

deploy.sh

@@ -22,7 +22,7 @@ CONFIG_DIR="/etc/pipekit"
 SECRETS_FILE="$CONFIG_DIR/secrets.env"
 
 if [ "$EUID" -ne 0 ]; then
-    exec sudo -E "$0" "$@"
+    exec sudo -H -E "$0" "$@"
 fi
 
 echo "== pipekit deploy =="