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.

examples/records.myc

@@ -0,0 +1,49 @@
+;; Benchmark: 3.4us
+;; Benchmark-Repeat: 573
+;; Output: ["Alice" 101 :admin "Zürich" ["Alice" "Bob"] true]
+
+; ---------------------------------------------------------
+; Records & Optimized Field Access Showcase
+; ---------------------------------------------------------
+
+(do
+  ; 1. Record Creation
+  ; Records use interned layouts for O(1) access and low memory overhead.
+  (def user {:id 101 :name "Alice" :role :admin})
+
+  ; 2. Optimized Field Access
+  ; These calls are transformed by the optimizer into specialized instructions.
+  (def name (.name user))
+  (def id (.id user))
+
+  ; 3. First-Class Field Accessors
+  ; Accessors start with a dot and can be passed around like functions.
+  (def get-role .role)
+  (def role (get-role user))
+
+  ; 4. Nested Records
+  (def company {
+    :name "Myc Corp"
+    :location {:city "Zürich" :zip 8000}
+    :employees [user {:id 102 :name "Bob" :role :dev}]
+  })
+
+  ; Deep access (also optimized)
+  (def city (.city (.location company)))
+
+  ; 5. Higher-Order usage
+  ; Accessors are perfect for mapping over data.
+  (def names ((fn [f list] 
+    (do
+      (def [e1 e2] list)
+      [(f e1) (f e2)]
+    )) 
+    .name (.employees company)))
+
+  ; 6. Structural Identity
+  ; Records with the same layout share memory; equality checks values.
+  (def is-equal (= {:x 1 :y 2} {:x 1 :y 2}))
+
+  ; Return a summary of all tested features
+  [name id role city names is-equal]
+)