feat: add Atomic Chat MCP tool skill

Exposes local Atomic Chat models (OpenAI-compatible API at
127.0.0.1:1337/v1) as tools to the container agent. Adds
atomic_chat_list_models and atomic_chat_generate alongside
the existing Ollama skill.

Rebased on current main:
- MCP server registered in agent-runner index.ts using bun (no tsc
  step in-image), sibling path to index.ts, env: {} with ATOMIC_CHAT_*
  forwarded when set.
- allowedTools entry moved to providers/claude.ts TOOL_ALLOWLIST.
- SKILL.md: drop obsolete per-group copy step (single RO mount
  supersedes it); use pnpm build.

Made-with: Cursor
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

container/agent-runner/src/index.ts

@@ -79,6 +79,14 @@ async function main(): Promise<void> {
       args: ['run', mcpServerPath],
       env: {},
     },
+    atomic_chat: {
+      command: 'bun',
+      args: ['run', path.join(__dirname, 'atomic-chat-mcp-stdio.ts')],
+      env: {
+        ...(process.env.ATOMIC_CHAT_HOST ? { ATOMIC_CHAT_HOST: process.env.ATOMIC_CHAT_HOST } : {}),
+        ...(process.env.ATOMIC_CHAT_API_KEY ? { ATOMIC_CHAT_API_KEY: process.env.ATOMIC_CHAT_API_KEY } : {}),
+      },
+    },
   };
 
   for (const [name, serverConfig] of Object.entries(config.mcpServers)) {