Remove assistant-complete text payload from orchestration flow

- Drop optional `text` from `ThreadMessageAssistantCompleteCommand`
- Stop passing text on assistant-complete ingestion and decider paths
- Ensure completion events no longer overwrite message content
9d46f3ab1dJulius Marminge committed on 2/27/2026, 4:40:09 AMparentf8ddb00
3 files changedLine totals unavailable