anvilspawn convenience: $PWD default workdir

scripts/anvilspawn

@@ -4,7 +4,7 @@
 
 set -e
 
-if [ $# -ne 3 ]; then
+if [ $# -lt 2 ]; then
     echo "Usage: $0 <backend> <role> <workdir>"
     echo "  backend: claude, kiro-cli"
     echo "  role:    developer, solo-developer, reviewer, tester, devops, researcher, taskmgr, author, technical-editor, ..."
@@ -15,6 +15,10 @@ BACKEND="$1"
 ROLE="$2"
 WORKDIR="$3"
 
+if [ -z $WORKDIR ]; then
+	WORKDIR="$PWD"
+fi
+
 NAMESPACE=$(namespace)
 if [ -z "$NAMESPACE" ]; then
     echo "Error: No namespace found. Is anvillm running?"