Story

Complete the implementation of OSImageStream parsing from multiple sources (CLI args, ConfigMap, ImageStream) and the stream building/merging logic.

Acceptance Criteria

• Complete ImageStream parsing logic:
  • Finish image label inspection error handling (check the POC PR)
  • Add proper logging for conflicts and missing labels
  • Handle partial stream data (OS image without Extensions or vice versa)
• Complete ConfigMap parsing with error handling
• Complete CLI args parsing
• Implement stream merging with defined precedence rules (CLI → ImageStream → ConfigMap)
• Add logging for stream collection and conflicts
• Validate default stream always exists after merging
• Add unit tests for all parsers and merging logic
• Document stream source precedence

Technical Notes:

• Focus on pkg/controller/osimagestream/ package
• No Kubernetes controller code yet - just the stream building logic
• Should be usable from both bootstrap and runtime contexts