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.

vault/_archive/tests/rhai/basic_crypto.rhai

@@ -0,0 +1,83 @@
+// basic_crypto.rhai
+// Basic cryptographic operations test
+
+print("=== Testing Basic Cryptographic Operations ===");
+
+// Test symmetric encryption
+print("Testing symmetric encryption...");
+let key = generate_key();
+let message = "Hello, World!";
+
+let encrypted = encrypt(key, message);
+let decrypted = decrypt(key, encrypted);
+
+if decrypted != message {
+    throw "Symmetric encryption/decryption failed";
+}
+print("✓ Symmetric encryption works correctly");
+
+// Test keyspace creation
+print("Testing keyspace creation...");
+clear_session();
+
+let created = create_key_space("test_space", "secure_password");
+if !created {
+    throw "Failed to create keyspace";
+}
+print("✓ Keyspace created successfully");
+
+// Test keyspace selection
+print("Testing keyspace selection...");
+let selected = select_keyspace("test_space");
+if !selected {
+    throw "Failed to select keyspace";
+}
+print("✓ Keyspace selected successfully");
+
+// Test keypair creation
+print("Testing keypair creation...");
+let keypair_created = create_keypair("test_keypair");
+if !keypair_created {
+    throw "Failed to create keypair";
+}
+print("✓ Keypair created successfully");
+
+// Test keypair selection
+print("Testing keypair selection...");
+let keypair_selected = select_keypair("test_keypair");
+if !keypair_selected {
+    throw "Failed to select keypair";
+}
+print("✓ Keypair selected successfully");
+
+// Test public key retrieval
+print("Testing public key retrieval...");
+let pub_key = keypair_pub_key();
+if pub_key == "" {
+    throw "Failed to get public key";
+}
+print("✓ Public key retrieved: " + pub_key);
+
+// Test signing and verification
+print("Testing digital signatures...");
+let test_message = "This is a test message for signing";
+let signature = sign(test_message);
+
+if signature == "" {
+    throw "Failed to sign message";
+}
+
+let is_valid = verify(test_message, signature);
+if !is_valid {
+    throw "Signature verification failed";
+}
+print("✓ Digital signature works correctly");
+
+// Test with wrong message
+let wrong_valid = verify("Wrong message", signature);
+if wrong_valid {
+    throw "Signature should not be valid for wrong message";
+}
+print("✓ Signature correctly rejects wrong message");
+
+print("=== All basic crypto tests passed! ===");