A venture firm just said the quiet part out loud: Things aren’t as copacetic in startup land as those sky-high AI valuations would suggest. Lux Capital on Tuesday published a letter it had sent to founders it has funded, urging them to prepare for a slew of business risks. The venture capital firm, which has backed Anduril and Ramp, noted that “signals suggest something is off,” observing that 10-year bond yields had fallen even while stocks were near record highs. That, the letter added, is “sometimes a recession indicator.”