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/load_existing_space.rhai

@@ -0,0 +1,65 @@
+// Example Rhai script demonstrating loading an existing key space for Hero Vault
+// This script shows how to load a previously created key space and use its keypairs
+
+// Define the key space name and password
+let space_name = "persistent_space";
+let password = "secure_password123";
+
+print("Loading existing key space: " + space_name);
+
+// Load the key space from disk
+if load_key_space(space_name, password) {
+    print("✓ Key space loaded successfully");
+    
+    // List available keypairs
+    let keypairs = list_keypairs();
+    print("Available keypairs: " + keypairs);
+    
+    // Use both keypairs to sign different messages
+    if select_keypair("persistent_key1") {
+        print("\nUsing persistent_key1:");
+        let message1 = "Message signed with the first keypair";
+        let signature1 = sign(message1);
+        print("Message: " + message1);
+        print("Signature: " + signature1);
+        
+        let is_valid1 = verify(message1, signature1);
+        if is_valid1 {
+            print("Verification: ✓ Valid");
+        } else {
+            print("Verification: ✗ Invalid");
+        }
+    }
+    
+    if select_keypair("persistent_key2") {
+        print("\nUsing persistent_key2:");
+        let message2 = "Message signed with the second keypair";
+        let signature2 = sign(message2);
+        print("Message: " + message2);
+        print("Signature: " + signature2);
+        
+        let is_valid2 = verify(message2, signature2);
+        if is_valid2 {
+            print("Verification: ✓ Valid");
+        } else {
+            print("Verification: ✗ Invalid");
+        }
+    }
+    
+    // Create an Ethereum wallet using one of the keypairs
+    print("\nCreating Ethereum wallet from persistent keypair:");
+    if select_keypair("persistent_key1") {
+        if create_ethereum_wallet() {
+            print("✓ Ethereum wallet created");
+            
+            let address = get_ethereum_address();
+            print("Ethereum address: " + address);
+        } else {
+            print("✗ Failed to create Ethereum wallet");
+        }
+    }
+} else {
+    print("✗ Failed to load key space. Make sure you've run key_persistence_example.rhai first.");
+}
+
+print("\nScript execution completed!");