fix: enforced global visible_skills in llm node validation and improved skill loading error handling across the project

assets/agents/coder/scripts/route_review_result.sh

@@ -14,6 +14,21 @@ review_attempts=$(echo "$state" | jq -r '.review_attempts // 0')
 max_review_attempts=$(echo "$state" | jq -r '.max_review_attempts // 1')
 review_notes=$(echo "$state" | jq -r '.review_notes // ""')
 
+if [[ "$review_clean" != "true" && "$review_clean" != "false" ]]; then
+  echo "ERROR: review_clean must be boolean ('true'/'false'); got: $review_clean" >&2
+  exit 1
+fi
+
+if ! [[ "$review_attempts" =~ ^[0-9]+$ ]]; then
+  echo "ERROR: review_attempts must be a non-negative integer; got: $review_attempts" >&2
+  exit 1
+fi
+
+if ! [[ "$max_review_attempts" =~ ^[0-9]+$ ]]; then
+  echo "ERROR: max_review_attempts must be a non-negative integer; got: $max_review_attempts" >&2
+  exit 1
+fi
+
 if [[ "$review_clean" == "true" ]]; then
   jq -nc '{"_next": "end_success"}'
   exit 0

assets/functions/tools/fs_grep.sh

@@ -28,6 +28,8 @@ main() {
     local grep_args=(-nH --color=never)
 
     if [[ -d "$search_path" ]]; then
+        # Use -r (not -R) so symlinks to directories are NOT followed - this avoids
+        # infinite loops on pathological symlink cycles (e.g. `ln -s . loop`).
         grep_args+=(-r)
         grep_args+=(
             --exclude-dir='.git'