- Refactored content block start/stop logic into `startCodexTextBlock` and `stopCodexTextBlock` for better readability and reusability. - Updated logic to ensure proper handling of "output_text" block events to avoid ghost stop emissions. - Added `TestConvertCodexResponseToClaude_StreamTextBeforeToolCallsDoesNotEmitGhostStop` to validate content block start/stop behavior in streamed responses.