QEMU Screenshot MCP Server

# TEAM_002: Run and Screenshot Tool Implementation ## Objective Implement `run_and_screenshot` - an atomic tool that starts QEMU, waits for boot, captures a screenshot, and shuts down in one deterministic step. ## Changes Made - Added `run_and_screenshot` tool to `server.py` - Arguments: `arch`, `image`, `screenshot_delay_seconds`, `extra_args` - Full QEMU lifecycle management - QMP-based screenshot capture - Graceful cleanup with fallback to force kill ## Handoff Checklist - [x] Implementation complete - [ ] README updated - [ ] Tests added (optional) - [ ] Pushed to git