v2.3 - Codex app & Errors Release

Codex app now works with the Kiro Gateway. Main error messages are now clear and actionable instead of cryptic API codes.

✨ New Features

• Codex app support - Added support for developer role used by OpenAI Codex app. Gateway now handles any unknown roles from OpenAI/Anthropic APIs by converting them to user role with proper message alternation (#64)
• Enhanced error messages - Centralized error enhancement system that translates cryptic Kiro API errors into clear messages. Added support for CONTENT_LENGTH_EXCEEDS_THRESHOLD and MONTHLY_REQUEST_COUNT errors (#10, #62, #63)

🐛 Bug Fixes

• MCP images support - Fixed image preservation from MCP tool results. Images from tools like browsermcp are now correctly passed to Kiro API (#57)
• Message structure validation - Fixed "Improperly formed request" when conversation starts with non-user message. Gateway now prepends synthetic user message when needed (#60)
• Thinking mode language - Extended thinking mode should respect user's language preference

📝 Documentation

• Added CONTRIBUTING.md with project philosophy and code quality standards

🙏 Contributors

• @Ry-DS - images in tool results support (#57)
• @bhaskoro-muthohar - root cause analysis for message structure validation (#60)

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Full Changelog: v2.2...v2.3