Agent - 4.2.1

• Fixed decision notifications not working with secure environment SDK keys
• Added documentation for Redis channel naming pattern in config.yaml
• PR 441

• Secure token parsing: Handle SDK keys with secure tokens in format sdkKey:apiKey for notification endpoints
• Enhanced notification handler to extract SDK key from secure token format

• Fixed notification handler test hanging issues
• Updated Go version to 1.23 for better compatibility
• Updated Alpine Docker base image from 3.21 to 3.20 for Go 1.23 compatibility
• Fixed test timeouts and formatting

• Improved Redis subscription documentation in config.yaml
• Added comprehensive unit tests for secure token parsing (7 test cases)

Full Changelog: https://github.com/optimizely/agent/compare/v4.2.0...v4.2.1