feat(schema-system): Implement comprehensive schema system with loading, validation, and export capabilities

- Added `SchemaLoader` for YAML parsing and model generation with caching and resolution strategies.
- Implemented `RefResolver` for handling `$ref` resolution with circular detection.
- Developed `SchemaValidator` for validating data against Pydantic models with structured error output.
- Created `SchemaExporter` for converting schemas to MCP, OpenAI, Anthropic, and generic formats.
- Introduced strict mode conversion for schemas to meet LLM provider requirements.
- Defined foundational types and annotations for schema definitions and validation results.
- Enhanced project version to 0.2.2 and updated dependencies in `pyproject.toml`.

Author: tercel

CHANGELOG.md

@@ -5,6 +5,22 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+
+## [0.2.2] - 2026-02-16
+
+### Removed
+
+#### Planning & Documentation
+- **planning/features/** - Moved all feature specifications to `apcore/docs/features/` for better organization with documentation
+- **planning/implementation/** - Restructured implementation planning to consolidate with overall project architecture
+
+### Changed
+
+#### Planning & Documentation Structure
+- **Implementation planning** - Reorganized implementation plans to streamline project structure and improve maintainability
+
+
+
 ## [0.2.1] - 2026-02-14
 
 ### Added