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/lambda_collector.rs

@@ -69,8 +69,8 @@ impl<'a> LambdaCollector<'a> {
                 }
             }
 
-            BoundKind::Map { entries } => {
-                for (k, v) in entries {
+            BoundKind::Record { fields } => {
+                for (k, v) in fields {
                     self.visit(k);
                     self.visit(v);
                 }