Add LICENSE and CHANGELOG

- Add MIT LICENSE file
- Add CHANGELOG.md documenting v1.0.0 through v1.2.0

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: mowens3

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [1.2.0] - 2025-01-09
+
+### Added
+- `McpError` fluent builder class with 15+ factory methods
+  - `notFound()`, `accessDenied()`, `validation()`, `rateLimited()`, etc.
+  - `withSuggestion()`, `withContext()`, `withDetail()` for adding metadata
+  - `toArray()`, `toToolResult()`, `toJsonRpcError()` conversion methods
+  - `retryAfter()` for rate limiting hints
+- `ErrorBag` class for collecting multiple errors
+  - `add()`, `addValidation()`, `merge()` for building error collections
+  - `forField()`, `byCategory()` for filtering errors
+  - `toToolResult()` for MCP responses
+  - Implements `Countable` and `IteratorAggregate`
+- `ErrorCode::getJsonRpcCode()` for JSON-RPC 2.0 error code mapping
+
+### Changed
+- Updated composer.json description to reflect new features
+
+## [1.1.0] - 2025-01-08
+
+### Added
+- Additional domain-specific error codes
+- `isRecoverable()` helper method
+- `getHttpStatus()` for HTTP status code mapping
+
+## [1.0.0] - 2025-01-07
+
+### Added
+- Initial release with `ErrorCode` constants
+- Error categorization (access, resource, validation, operation, domain)
+- Helper methods: `getCategory()`, `isValid()`, `getAllCodes()`

LICENSE

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+MIT License
+
+Copyright (c) 2025 Code Wheel
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.