single word requests - “Mathematics” is to “mathematical” as “programming” is to what?

I thought of programmatic but that doesn't seem right because it puts too much stress on the automation side and not on the actual development and logical side of it.

A place to collect your mathematical and [programming] thoughts.

Answer

To fill in the blank in the specific phrase "[programming] thoughts," the most natural option to me is simply programming. (Examples of this type of phrasing being used: "Programming Thoughts" (Youtube Video), "Coding thoughts")

It's true that parallelism seems to call for an adjective in the construction "mathematical and [programming] thoughts," but there simply is no commonly used adjective with this meaning. Programmatic usually means

connected with, suggesting or following a plan

• programmatic reforms

(Oxford Advanced Learner's Dictionary)

and programmatical is very rarely used.

I'd advise rephrasing to something like "thoughts on mathematics and programming" or "thoughts about mathematics and programming."