fix(search): stabilize brave mcp skill args

skills/brave-mcp-search/scripts/search.sh

@@ -14,15 +14,15 @@ OPTS_JSON="$(printf '%s' "$OPTS_JSON_RAW" | jq -c '. // {}')"
 
 ARGS_JSON="$(jq -cn --arg q "$QUERY" --arg opts "$OPTS_JSON" '
   ($opts | fromjson) as $o |
-  {
+  ({
     query: $q,
     country: ($o.country // "US"),
     search_lang: ($o.search_lang // "en"),
     ui_lang: ($o.ui_lang // "en-US"),
-    count: ($o.count // 5),
-    freshness: ($o.freshness // empty),
-    safesearch: ($o.safesearch // empty)
+    count: ($o.count // 5)
   }
+  + (if ($o.freshness? // null) != null then {freshness: $o.freshness} else {} end)
+  + (if ($o.safesearch? // null) != null then {safesearch: $o.safesearch} else {} end))
 ')"
 
 RAW="$(mcporter call --allow-http "$URL.brave_web_search" --args "$ARGS_JSON" --output json)"