release: v0.5.0 - Type-Aware Transformation System

Major Features:
- Type-aware transformation system with transform() and pipe()
- Enhanced numeric coercion (empty strings → 0/0.0)
- Array filtering with auto-reindexing
- Dynamic type context switching
- 27 new tests (103 total, 250 assertions)

This release establishes the foundation for extensible data transformations
while maintaining our 'Extensibility Over Reinvention' philosophy.

Author: lemmon

CHANGELOG.md

@@ -4,6 +4,8 @@ All notable changes to this project will be documented in this file.
 
 ## [Unreleased]
 
+## [0.5.0] - 2024-12-19
+
 ### Added
 - **Enhanced Numeric Coercion**: `IntValidator` and `FloatValidator` now coerce empty strings to 0/0.0 respectively
   - Addresses real-world HTML form scenarios where empty fields are common