Add session management commands and tests

Introduces new session management commands: sessions, session-clear, session-prune, secure-session-start, and secure-sessions. Refactors session logic for extensibility, adds encryption/decryption for secure sessions, and provides utilities for session file handling. Includes comprehensive unit tests for session utilities and encryption functions.

Author: YoungMayor

cmd/root.go

@@ -66,6 +66,11 @@ func init() {
 
 	// New commands for v0.5.0 - Session management
 	rootCmd.AddCommand(commands.SessionStartCmd)
+	rootCmd.AddCommand(commands.SessionsCmd)
+	rootCmd.AddCommand(commands.SessionClearCmd)
+	rootCmd.AddCommand(commands.SessionPruneCmd)
+	rootCmd.AddCommand(commands.SecureSessionStartCmd)
+	rootCmd.AddCommand(commands.SecureSessionsCmd)
 
 	// New commands for v0.5.0 - Alias management
 	rootCmd.AddCommand(commands.AliasListCmd)