feat: Update SAL Vault examples and documentation

- Renamed examples directory to `_archive` to reflect legacy status.
- Updated README.md to reflect current status of vault module,
  including migration from Sameh's implementation to Lee's.
- Temporarily disabled Rhai scripting integration for the vault.
- Added notes regarding current and future development steps.

examples/hero_vault/_archive/key_persistence_example.rhai

@@ -0,0 +1,65 @@
+// Example Rhai script demonstrating key space persistence for Hero Vault
+// This script shows how to create, save, and load key spaces
+
+// Step 1: Create a key space
+let space_name = "persistent_space";
+let password = "secure_password123";
+
+print("Creating key space: " + space_name);
+if create_key_space(space_name, password) {
+    print("✓ Key space created successfully");
+    
+    // Step 2: Create keypairs in this space
+    print("\nCreating keypairs...");
+    if create_keypair("persistent_key1", password) {
+        print("✓ Created first keypair");
+    }
+    
+    if create_keypair("persistent_key2", password) {
+        print("✓ Created second keypair");
+    }
+    
+    // List all keypairs
+    let keypairs = list_keypairs();
+    print("Available keypairs: " + keypairs);
+    
+    // Step 3: Clear the session (simulate closing and reopening the CLI)
+    print("\nClearing session (simulating restart)...");
+    // Note: In a real script, you would exit here and run a new script
+    // For demonstration purposes, we'll continue in the same script
+    
+    // Step 4: Load the key space from disk
+    print("\nLoading key space from disk...");
+    if load_key_space(space_name, password) {
+        print("✓ Key space loaded successfully");
+        
+        // Verify the keypairs are still available
+        let loaded_keypairs = list_keypairs();
+        print("Keypairs after loading: " + loaded_keypairs);
+        
+        // Step 5: Use a keypair from the loaded space
+        print("\nSelecting and using a keypair...");
+        if select_keypair("persistent_key1") {
+            print("✓ Selected keypair");
+            
+            let message = "This message was signed using a keypair from a loaded key space";
+            let signature = sign(message);
+            print("Message: " + message);
+            print("Signature: " + signature);
+            
+            // Verify the signature
+            let is_valid = verify(message, signature);
+            if is_valid {
+                print("Signature verification: ✓ Valid");
+            } else {
+                print("Signature verification: ✗ Invalid");
+            }
+        }
+    } else {
+        print("✗ Failed to load key space");
+    }
+} else {
+    print("✗ Failed to create key space");
+}
+
+print("\nScript execution completed!");