Haha this is surprisingly and exactly how I use claude as well. Quite fascinating that we independently discovered the same workflow.

I maintain two directories: "docs/proposals" (for the research md files) and "docs/plans" (for the planning md files). For complex research files, I typically break them down into multiple planning md files so claude can implement one at a time.

A small difference in my workflow is that I use subagents during implementation to avoid context from filling up quickly.