update doc and optimize

AINative_OKR_CASAN5/.specify/scripts/bash/model-router.sh

@@ -9,4 +9,12 @@ set -euo pipefail
 # and usage logging live in model-call.py.
 
 SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+
+# Opt-in governance preflight (default off ⇒ no change to existing flows).
+# When enabled, enforces RAI data governance (e.g. PII must not reach a cloud
+# model without approval) BEFORE the model call.
+if [[ "${CASAN_PREFLIGHT:-0}" == "1" ]]; then
+  bash "$SCRIPT_DIR/harness-preflight.sh" "$@" >/dev/null || exit $?
+fi
+
 exec python "$SCRIPT_DIR/model-call.py" "$@"