◇ Could this help me?
Yes. The two ideas doing the real work here are sound and underused: a strictly read-only research pass before anything is written, and file-scoped permissions so two agents can work at once without overwriting each other. The human approval gate placed after the plan and before the code is exactly where it belongs. Expect a real cost in tokens and wall-clock time, so reserve this shape for substantial features rather than small changes, and keep reading the validator's output yourself rather than treating a passing report as sign-off. This is a general practice.
Set up a role-separated workflow for building a feature in this repo. First a read-only research pass that maps existing patterns, similar features, and risks without editing anything. Then turn my rough request into a user story with acceptance criteria and edge cases, then a technical blueprint covering data model, interfaces, file changes, and migrations, and stop there for my approval. After I approve, implement backend and frontend as separate passes with non-overlapping file scopes, then write end-to-end tests proving the acceptance criteria, then run a final validation pass reporting anything missing, insecure, or inconsistent with the story.