Pipeline step records 

Pipeline step records store per-step configuration:

• assistant profile reference;
• title and processor identifier; retriever titles also identify their prompt-visible retrieval group and must be unique within the pipeline;
• stage and type;
• prompt inclusion flags;
• step-specific prompts;
• history mode and history limit;
• LLM settings;
• retrieval settings;
• context limits;
• metadata field lists;
• failure strategy.

Prompt text for project behaviour belongs here or in assistant profiles, not in processor PHP code.