I have been building this in my free time and it might be relevant to you: https://github.com/jbonatakis/blackbird

I have the same basic workflow as you outlined, then I feed the docs into blackbird, which generates a structured plan with task and sub tasks. Then you can have it execute tasks in dependency order, with options to pause for review after each task or an automated review when all child task for a given parents are complete.

It’s definitely still got some rough edges but it has been working pretty well for me.