Update: everything is still alive, however some plants are in "standby mode".
I found the real solution to my quest: selective breeding. David the Good on YouTube has a video about it, and the book he references has a .pdf available for free.
Covercrops- sorghum/Sudan is a really good choice. You can also look at species that need vernalization to set seed. Things like purple top turnips, seven top turnips, winter triticale, etc.
As for heat tolerance, look at specific varieties. For example beit alpha types of cucumbers (bred for the middle east heat). Indeterminate greenhouse tomatoes tend to produce better in heat than determinate ones, etc.
I know nothing, except I'm I'm in a similar climate and my hot peppers and cucumbers are doing well but banana and bell are hurting. It's very strange but may have something to do with pH, maybe? All of my stuff is in the ground and I did very little prep.
Cherry tomatoes grew fine over the summer. Most things just needed low intensity morning sun then shade afterwards. I planted a couple trees to help out.