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/macro_financial.myc

@@ -1,5 +1,5 @@
-;; Benchmark: 351ns
-;; Benchmark-Repeat: 5716
+;; Benchmark: 401ns
+;; Benchmark-Repeat: 5016
 ;; Financial DSL Macro example
 ;; Demonstrates generating complex records from simple parameters.
 ;; Output: {:price 100, :size 2, :total 200}