AI agent reliability startup Lemma has raised $2.3 million in pre-seed funding to build monitoring infrastructure designed to catch a particularly difficult class of problem: AI agents that appear to have completed a task successfully while quietly producing the wrong result. The round includes participation from Matrix, Y Combinator, Liquid 2 Ventures, Vermilion Cliffs Ventures, Irregular Expressions, Cervin Ventures, Comma Capital, Position Ventures, and Eight Capital, alongside angel…