Refactor: Rename map to record

This commit renames `Map` to `Record` and updates all related AST nodes,
binders, type checkers, and runtime values to reflect this change. This
is a semantic change to better align with common programming language
terminology.

src/ast/compiler/upvalues.rs

@@ -103,8 +103,8 @@ impl UpvalueAnalyzer {
                     Self::visit(el, scopes, capture_map, current_lambda.clone());
                 }
             }
-            UntypedKind::Map { entries } => {
-                for (k, v) in entries {
+            UntypedKind::Record { fields } => {
+                for (k, v) in fields {
                     Self::visit(k, scopes, capture_map, current_lambda.clone());
                     Self::visit(v, scopes, capture_map, current_lambda.clone());
                 }