Refactor: Implement Record Layouts and Optimized Field Access

Introduces a new `RecordLayout` system for efficient and type-safe
record handling.

Key changes:
- `RecordLayout` struct with `O(1)` field lookup using FMap
  optimization.
- Field accessors (`.name`) are now first-class callable values.
- Parser recognizes dot-prefixed identifiers as field accessors.
- Binder and TypeChecker handle field accessors.
- Optimizer transforms field accessor calls into specialized `GetField`
  nodes.
- VM executes `GetField` efficiently by directly accessing record
  values.
- Adds a new `records.myc` example showcasing record features.
- Improves comparison logic for records to use pointer equality for
  layout.

src/ast/compiler/optimizer/utils.rs

@@ -68,6 +68,9 @@ impl UsageInfo {
                 self.assigned.insert(*addr);
                 self.collect(value);
             }
+            BoundKind::GetField { rec, .. } => {
+                self.collect(rec);
+            }
             BoundKind::Lambda {
                 params,
                 body,
@@ -147,7 +150,10 @@ impl UsageInfo {
             BoundKind::Expansion { bound_expanded, .. } => {
                 self.collect(bound_expanded);
             }
-            _ => {}
+            BoundKind::Again { args } => {
+                self.collect(args);
+            }
+            BoundKind::Nop | BoundKind::FieldAccessor(_) | BoundKind::Extension(_) => {}
         }
     }