add-codex

# Codex agent provider NanoClaw runs agents in a long-lived **poll loop** inside the container. The backend is selected with **`AGENT_PROVIDER`** (`claude` | `opencode` | `codex` | `mock`). Trunk ships with only the `claude` provider baked in. This skill copies the Codex provider files in from the `providers` branch, wires them into the host and container barrels, updates the Dockerfile to install the Codex CLI, and rebuilds the image. The Codex provider runs `codex app-server` as a child process and speaks JSON-RPC over stdio. That gives it native session resume, streaming events, MCP tool access, and `thread/compact/start` compaction — same feature bar as the Claude Agent SDK, without the Anthropic-only lock-in. ## Install ### Pre-flight If all of the following are already present, skip to **Configuration**: - `src/providers/codex.ts` - `container/agent-runner/src/providers/codex.ts` - `container/agent-runner/src/providers/codex-app-server.ts` - `container/agent-runner/src/providers/codex.factory.test.ts` - `import './codex.js';` line in `src/providers/index.ts` - `import './codex.js';` line in `container/agent-runner/src/providers/index.ts` - `ARG CODEX_VERSION` and `"@openai/codex@${CODEX_VERSION}"` in the pnpm global-install block in `container/Dockerfile` 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 Codex source files Wholesale copies (o...