add-opencode

# OpenCode agent provider NanoClaw runs agents in a long-lived **poll loop** inside the container. The backend is selected per agent group by the **`provider`** key in that group's `container.json` (materialized from the `container_configs` table) — set it with `ncl groups config update --provider opencode`. Default is `claude`. Trunk ships with only the `claude` provider baked in. This skill copies the OpenCode provider files in from the `providers` branch, wires them into the host and container barrels, installs dependencies, and rebuilds the image. ## Install ### Pre-flight If all of the following are already present, skip to **Configuration**: - `src/providers/opencode.ts` - `container/agent-runner/src/providers/opencode.ts` - `src/providers/opencode-registration.test.ts` - `container/agent-runner/src/providers/opencode-registration.test.ts` - `import './opencode.js';` line in `src/providers/index.ts` - `import './opencode.js';` line in `container/agent-runner/src/providers/index.ts` - `@opencode-ai/sdk` in `container/agent-runner/package.json` - `ARG OPENCODE_VERSION` and `"opencode-ai@${OPENCODE_VERSION}"` in `container/Dockerfile` - `src/opencode-dockerfile.test.ts` (the Dockerfile install guard) Missing pieces — continue below. All steps are idempotent; re-running is safe. ### 1. Fetch the providers branch ```bash git fetch origin providers ``` ### 2. Copy the OpenCode source files Wholesale copies (owned entirely by this skill — user edits to these files w...