OpenAI Reasoning Model Errors

When using OpenAI reasoning models (o1, o3, o4-mini) via LiteLLM/Azure, you may see:

Item 'rs_...' of type 'reasoning' was provided without its required following item.

OpenAI's Responses API requires reasoning items to always be followed by an output item (text, tool-call). This error occurs when:

• The model produces reasoning then immediately makes tool calls (no text between)
• The stream is interrupted after reasoning but before output
• Only reasoning was generated in a turn

The fix in src/ipc/utils/ai_messages_utils.ts filters orphaned reasoning parts within cleanMessage() before sending conversation history back to OpenAI.