Opencode Controller

This is a workflow enforcer for Opencode that keeps Claude from writing code directly and instead orchestrates it through Opencode's plan and build agents. It handles the session setup, model selection, and authentication flow, then enforces a strict loop: always plan first, get approval, then build. If the build agent hits a question, it forces you back to planning. The core insight here is useful: separating planning from execution prevents half-baked implementations. You'll want this if you're already using Opencode and find yourself or Claude skipping the planning step or trying to answer design questions mid-build. It's basically guard rails for a two-phase workflow.