more filter fixes

src/queryer/mod.rs

@@ -21,9 +21,9 @@ impl Queryer {
   pub fn query(
     &self,
     schema_id: &str,
-    filters: Option<&serde_json::Value>,
+    filter: Option<&serde_json::Value>,
   ) -> crate::drop::Drop {
-    let filters_map = filters.and_then(|f| f.as_object());
+    let filters_map = filter.and_then(|f| f.as_object());
 
     // 1. Process filters into structured $op keys and linear values
     let (filter_keys, args) = match self.parse_filter_entries(filters_map) {
@@ -35,7 +35,7 @@ impl Queryer {
           details: crate::drop::ErrorDetails {
             path: None, // filters apply to the root query
             cause: Some(msg),
-            context: filters.cloned(),
+            context: filter.cloned(),
             schema: Some(schema_id.to_string()),
           },
         }]);