>The blast of sterilizing radiation at that distance, combined with being tidally locked
>and probably wracked with catastrophic earthquakes at that distance would make
>life on these planets an unlikely impossibility. ____
For the X-ray blasts you need a tendril or a root or something that goes deep enough down into the dirt/water to survive and regrow. UV tolerance is easy if you can accept the loss of your photosynthesizing bits and regrow them from the opaque parts. Most living things are really not troubled by earthquakes (Trappist quakes?) We have trouble with them because we build things that are rigid. The main effect from being tidally locked is that you don't need to move your leaves around to follow the sun, you just grow and aim them once and leave them. You might even get concentric rings of plants with different brightness requirements growing all the way along the sunny edge.
I don't know if life would be easy, but let's not give up yet.