The new source code
I write a prompt. Claude Code generates a markdown file with a solution. I read it, adapt it to my needs, then check that refined specification into git.
Many developers craft detailed prompts, get generated code back, then delete the prompt and keep only the implementation.
These adapted markdown files contain the real intent. The code contains one possible expression of that intent.
The code will change. The intent remains.
So version control your thinking, not just your implementations.