docs(changelog): add type-safe field references feature to v4.3.2

Add comprehensive changelog entry for the type-safe field name references
feature merged in PR #108, including FieldStr utility and BaseMeta metaclass
implementation details.

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: HosseinNejatiJavaremi

docs/changelog.md

@@ -4,6 +4,20 @@ All notable changes to ArchiPy are documented in this changelog, organized by ve
 
 ## [v4.3.2] - 2026-02-23
 
+### Added
+
+#### Models - DTOs
+
+- **Type-Safe Field References** - Enhanced BaseDTO with automatic field name references
+    - Implemented `FieldStr` utility class for type-safe field name representation
+    - Added `BaseMeta` metaclass that automatically exposes field names as class attributes
+    - All DTO subclasses now support IDE autocompletion for field names (e.g., `PaginationDTO.page` returns `FieldStr("page")`)
+    - Eliminates hardcoded field name strings and enables better refactoring support
+    - Instance attribute access remains unaffected - only class-level access provides `FieldStr` objects
+    - Memory-efficient implementation using `__slots__` in `FieldStr`
+    - Updated `range_dtos.py` model validators to use type-safe field references
+    - Added comprehensive BDD tests covering `FieldStr` behavior
+
 ### Changed
 
 #### Dependencies