Add version display and bump to 0.2.0

- Added --version/-V option to show version
- Bumped version from 0.1.0 to 0.2.0
- Updated description to mention game mode

Users can now verify which version is running with:
  aigpt --version

This helps debug whether the latest build is being used.

src/main.rs

@@ -10,7 +10,9 @@ use mcp::BaseMCPServer;
 
 #[derive(Parser)]
 #[command(name = "aigpt")]
+#[command(version)]
 #[command(about = "Simple memory storage for Claude with MCP")]
+#[command(long_about = "AI memory system with psychological priority scoring and game-style results!")]
 struct Cli {
     #[command(subcommand)]
     command: Commands,