fix: improve maintenance and synchronize live conversations

scripts/check-python-unused.sh

@@ -0,0 +1,10 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+root_dir=$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")/.." && pwd)
+
+exec ruff check --select F401,F841 --no-cache \
+  "$root_dir/backend" \
+  "$root_dir/deploy" \
+  "$root_dir/e2e" \
+  "$root_dir/relicense_headers.py"