I don't really know why it's important to "provide a durable record of a decision made during the implementation of a feature", but other than that I do something similar. I have the agent write a PLAN.md which looks just like this IDR template. It's written before implementation begins, and I approve it before the agent goes. I don't save them after the session ends.
For each project, I define "review surfaces": parts of the code that I have a strong opinion about. These get resolved in detail before implementation begins; the LLM can do whatever it wants to other parts of the code, but the parts I list can't change without another review. Typically, these are things like the public API or database schema.
For each project, I define "review surfaces": parts of the code that I have a strong opinion about. These get resolved in detail before implementation begins; the LLM can do whatever it wants to other parts of the code, but the parts I list can't change without another review. Typically, these are things like the public API or database schema.