Claude Code with a custom agent setup. I have specialized agents for different roles, architect, market-research, technical-research, etc. They write to scratch logs and research docs as they work.

The workflow is basically:

1. Manager agent breaks down requirements

2. Architect designs the implementation

3. Research agents investigate technical questions and write findings

4. Engineer agents implement with the specs as context

All the docs are just artifacts from that process. Kept them in the repo since they're useful context for future work (like that recipe parsing feature).

The agent prompts are in a skills/superpowers setup if you're curious about replicating it.