Function warmstart_teacher_trace_from_jsonl_reader 

pub fn warmstart_teacher_trace_from_jsonl_reader<R: BufRead>(
    reader: R,
    contract: &WarmStartExactJhTeacherContract,
    return_horizon: usize,
) -> Result<WarmStartExactJhTeacherTrace, WarmStartExactJhError>

Parse a normalized planner JSONL trace into a warm-start teacher trace.