A bunch of things came together, causing me to stay up until 2am, writing the initial JavaScript for a new iOS and Android game, and web site.
I bought the domain Kakuro-Master.com, created a web site for it on my Digital Ocean machine, and wrote enough code to generate a board and display it in a table. I'm not done with that, but having gotten this far in a few hours of hacking, I'm motivated to keep going.
What I have written so far is live at Kakuro-Master.com. All you can do with it at present is fill in a number from 2 to 9 (the maximum run length) and press the "Generate" button.
The code is on GitHub.
Keep your eyes on the kakuro-master tag for future reports.
Nice to have another personal project. Maybe I'll make some money with this one.