v0.3.0-rc.0

What's Changed

🚀 New Features

S3-Compatible Storage (OSS3)

• Complete S3 protocol implementation with full observability and monitoring
• Multipart upload support for large files (1E-4)
• SigV4 signature verification with AWS SDK integration
• CORS middleware for cross-origin requests
• Business restriction middleware with content-type validation
• Transaction boundary and compensation for atomic operations
• Access log middleware with structured logging
• MinIO backend integration with comprehensive test coverage

File Attachments for Agent

• Load file attachments from OSS in user messages (images and text files)
• Parallel file loading for improved performance with multiple attachments
• MultiContent merge for consecutive user messages with images
• Image preprocessing pipeline: format detection, resizing, quality degradation
• Text file support with UTF-8 validation and truncation for large files
• UserID propagation through context for background worker processing

🔧 Improvements

Code Quality

• Comprehensive code quality improvements across 32+ review findings
• Eliminated redundant parsing and struct duplication
• Improved error handling and transaction support in repositories
• Enhanced SigV4 signature verification with proper credential caching

Testing

• Added comprehensive test coverage for file attachments and message conversion
• MinIO backend integration tests
• S3 protocol layer integration test scaffolding
• Edge case tests for security and error handling

🐛 Bug Fixes

Critical Security

• Resolved critical security issues in OSS3 protocol implementation
• Fixed SigV4 signature verification vulnerabilities
• Corrected error mapping for insufficient storage scenarios

Integration

• Fixed transaction support and error handling in OSS3 repositories
• Resolved review findings from comprehensive S3 protocol audit
• Fixed pagination infinite loop in integration tests
• Corrected user ID handling in integration tests

📝 Documentation

• Added comprehensive testing guide for OSS3
• Enhanced code comments and API documentation

🔄 Breaking Changes

None - this is a backward-compatible release.

New Contributors

This release includes significant contributions from code review findings and comprehensive testing efforts.

Full Changelog: v0.2.2...v0.3.0-rc.0