Initial implementation of xtrm-agent multi-agent system

Multi-agent AI automation system with shared message bus, specialized
roles (coder/researcher/reviewer), and deny-by-default security.

- Config system with Pydantic validation and YAML loading
- Async message bus with inter-agent delegation
- LLM providers: Anthropic (Claude) and LiteLLM (DeepSeek/Kimi/MiniMax)
- Tool system: registry, builtins (file/bash/web), approval engine, MCP client
- Agent engine with tool-calling loop and orchestrator for multi-agent management
- CLI channel (REPL) and Discord channel
- Docker + Dockge deployment config
- Typer CLI: chat, serve, status, agents commands

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

CLAUDE.md

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+# xtrm-agent — Claude Code Instructions
+
+## Project
+Multi-agent AI automation system with shared message bus, specialized roles, and deny-by-default security.
+
+## Stack
+- Python 3.12+, uv for dependency management
+- Anthropic SDK for Claude, LiteLLM for DeepSeek/Kimi/MiniMax
+- discord.py for Discord, prompt-toolkit + rich for CLI
+- MCP Python SDK for tool server connections
+- Pydantic for config validation, typer for CLI
+
+## Structure
+- `xtrm_agent/` — Main package
+- `xtrm_agent/llm/` — LLM providers (Anthropic, LiteLLM)
+- `xtrm_agent/tools/` — Tool registry, builtins, approval, MCP, delegate
+- `xtrm_agent/channels/` — CLI and Discord channels
+- `agents/` — Agent definitions (markdown + YAML frontmatter)
+- `config.yaml` — Main configuration
+
+## Commands
+- `uv run xtrm-agent chat` — Interactive REPL
+- `uv run xtrm-agent chat -m "msg"` — Single-shot
+- `uv run xtrm-agent serve` — Production (Discord + all agents)
+- `uv run xtrm-agent status` — Show config
+- `uv run xtrm-agent agents` — List agents
+
+## Key Patterns
+- Message bus (asyncio queues) decouples channels from agents
+- Router resolves @mentions, channel defaults, delegation targets
+- Per-agent tool filtering via registry.filtered()
+- Deny-by-default approval engine
+- Agent definitions in markdown with YAML frontmatter
+- Inter-agent delegation via DelegateTool + AgentMessage bus