Setup dev container and MCP infrastructure

Add dev container configuration with docker-compose, Dockerfile, and entrypoint script

- Create .devcontainer/devcontainer.json for VS Code dev container
- Create .devcontainer/docker-compose.yml for container setup
- Add Dockerfile with Python, Go, Rust, R, and jj tools
- Add docker-entrypoint.sh to initialize .ai_index and start mcp-server
- Add Makefile for container management and MCP operations
- Add .gitignore entries for AI index
- Add OpenCode global instructions
- Add basic MCP server and tool for listing Go imports
- Add Zed integration configuration
- Update README with project vision and structure

opt/bin/mcp-server

@@ -0,0 +1,5 @@
+#!/bin/bash
+echo "[MCP] Starting..." >> /workspace/.ai_index/mcp.log
+python3 /opt/dev-tools/list_imports.py "$@" >> /workspace/.ai_index/mcp.log 2>&1 &
+echo $! > /workspace/.ai_index/mcp.pid
+wait