feat(skills): add DuckDuckGo search skill as Firecrawl fallback

skills/research/duckduckgo-search/scripts/duckduckgo.sh

@@ -0,0 +1,32 @@
+#!/bin/bash
+# DuckDuckGo Search Helper Script
+# Fallback for when ddgs library is unavailable
+# Usage: ./duckduckgo.sh [text|images|news|videos] <query> [limit]
+
+set -e
+
+MODE="${1:-text}"
+QUERY="$2"
+LIMIT="${3:-5}"
+
+if [ -z "$QUERY" ]; then
+    echo "Usage: $0 [text|images|news|videos] <query> [limit]"
+    echo "Examples:"
+    echo "  $0 text 'python async' 5"
+    echo "  $0 images 'cat' 10"
+    exit 1
+fi
+
+# URL encode query
+ENCODED_QUERY=$(echo "$QUERY" | sed 's/ /+/g' | sed 's/&/%26/g' | sed 's/=/%3D/g')
+
+case "$MODE" in
+    text|images|news|videos)
+        curl -s "https://api.duckduckgo.com/?q=${ENCODED_QUERY}&format=json&limit=${LIMIT}"
+        ;;
+    *)
+        echo "Unknown mode: $MODE"
+        echo "Valid modes: text, images, news, videos"
+        exit 1
+        ;;
+esac