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/nodes.rs

@@ -86,8 +86,8 @@ pub enum UntypedKind {
     Tuple {
         elements: Vec<Node<UntypedKind>>,
     },
-    Map {
-        entries: Vec<(Node<UntypedKind>, Node<UntypedKind>)>,
+    Record {
+        fields: Vec<(Node<UntypedKind>, Node<UntypedKind>)>,
     },
     /// A macro declaration that can be expanded at compile time.
     MacroDecl {
@@ -99,7 +99,7 @@ pub enum UntypedKind {
     Template(Box<Node<UntypedKind>>),
     /// A placeholder inside a template to be replaced by a node or value. (Unquote)
     Placeholder(Box<Node<UntypedKind>>),
-    /// A placeholder that flattens a sequence or merges a map into its surroundings. (Splice)
+    /// A placeholder that flattens a sequence or merges a record into its surroundings. (Splice)
     Splice(Box<Node<UntypedKind>>),
     /// Represents an expanded macro call, preserving the original call for debugging.
     Expansion {