Initial commit: Multiplayer Snake game with server discovery

Implemented a complete network multiplayer Snake game with the following features:

Core Game:
- Client-server architecture using asyncio for networking
- Pygame-based rendering at 60 FPS
- Server-authoritative game state with 10 TPS
- Collision detection (walls, self, other players)
- Food spawning and score tracking
- Support for multiple players with color-coded snakes

Server Discovery:
- UDP multicast-based automatic server discovery (239.255.0.1:9999)
- Server beacon broadcasts presence every 2 seconds
- Client discovery with 3-second timeout
- Server selection UI for multiple servers
- Auto-connect for single server
- Graceful fallback to manual connection

Project Structure:
- src/shared/ - Protocol, models, constants, discovery utilities
- src/server/ - Game server, game logic, server beacon
- src/client/ - Game client, renderer, discovery, server selector
- tests/ - Unit tests for game logic, models, and discovery

Command-line interface with argparse for both server and client.
Comprehensive documentation in README.md and CLAUDE.md.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

run_client.py

@@ -0,0 +1,46 @@
+"""Run the Snake game client."""
+
+import asyncio
+import argparse
+from src.client.game_client import main
+from src.shared.constants import DEFAULT_PORT
+
+
+async def run_client() -> None:
+    """Run the client with command line arguments."""
+    parser = argparse.ArgumentParser(description="Run the Snake game client")
+    parser.add_argument(
+        "host",
+        nargs="?",
+        default=None,
+        help="Server host address (omit to use auto-discovery)",
+    )
+    parser.add_argument(
+        "--port",
+        type=int,
+        default=DEFAULT_PORT,
+        help=f"Server port number (default: {DEFAULT_PORT})",
+    )
+    parser.add_argument(
+        "--name",
+        default="Player",
+        help="Your player name (default: Player)",
+    )
+    parser.add_argument(
+        "--discover",
+        action="store_true",
+        help="Force server discovery even if host is specified",
+    )
+
+    args = parser.parse_args()
+
+    await main(
+        host=args.host,
+        port=args.port,
+        name=args.name,
+        discover=args.discover,
+    )
+
+
+if __name__ == "__main__":
+    asyncio.run(run_client())