My workflow is quite similar, but it's leveraging Notion instead of markdown files.

https://github.com/tessellate-digital/notion-agent-hive

The main reason is we're already using Notion at work, and I wanted something where I could easily add/link to existing documents.

Sample size of one, but I've noticed a considerable improvement after adding a "final review" step, going through the plan and looking at the whole code change, over a naive per-task "implement-review" cycle.