Add Atomic Chat Integration

This skill adds a stdio-based MCP server that exposes models running in the local Atomic Chat desktop app as tools for the container agent. Claude remains the orchestrator but can offload work to local models served by Atomic Chat on http://127.0.0.1:1337/v1 (OpenAI-compatible).

Tools exposed:

• atomic_chat_list_models — list models currently available in Atomic Chat (GET /v1/models)
• atomic_chat_generate — send a prompt to a specified model and return the response (POST /v1/chat/completions)

Model management (download, delete) is done through the Atomic Chat desktop UI — the app is a fork of Jan and manages its own model library.

The skill ships the MCP server source in this folder and copies it into the agent-runner tree at install time, then wires it up with small edits to index.ts, providers/claude.ts, and container-runner.ts. No branch merge — all edits are additive and idempotent.

Phase 1: Pre-flight

Check if already applied

Check if container/agent-runner/src/atomic-chat-mcp-stdio.ts exists. If it does, skip to Phase 3 (Configure).

Check prerequisites