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 ### 1. Copy the provider payload Fetch the `providers` branch from the configured remote that carries it, then overwrite every skill-owned provider file with its canonical registry copy: ```nc:copy from-branch:providers src/providers/opencode.ts src/providers/opencode-registration.test.ts container/agent-runner/src/providers/opencode.ts container/agent-runner/src/providers/mcp-to-opencode.ts container/agent-runner/src/providers/mcp-to-opencode.test.ts container/agent-runner/src/providers/opencode-registration.test.ts container/agent-runner/src/providers/opencode.attachments.test.ts container/agent-runner/src/providers/opencode.compaction.test.ts container/agent-runner/src/providers/opencode.config.test.ts container/agent-runner/src/providers/opencode.factory.test.ts container/agent-runner/src/providers/opencode.memory.test.ts container/agent-runner/src/providers/opencode.question.test.ts ``` (`cwd-shim.ts` and ...