llm-calls.jsonl carries the prompts as sent, the candidate list as the model
saw it, the screenshot reference, the raw response, tokens, latency and how the
step ended. It sits beside trace.jsonl rather than inside it because every trace
line already carries a full hierarchy and both the replay server and the
campaign summarizer scan all of them; folding prompts in would grow the lines
those readers parse for data neither reads.
Claude-Session: https://claude.ai/code/session_01A5KmftdEJ49A9z5mF5ESrX
