fix(lastpass): use correct lpass add command for new secrets

The lastpass CLI uses `lpass add` for creating new items, not `lpass set`
which doesn't exist. This was a typo introduced in commit 3221782.

Fixes #54

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: domenkozar

CHANGELOG.md

@@ -7,6 +7,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Fixed
+- LastPass provider: Fix creating new secrets by using correct `lpass add` command instead of non-existent `lpass set` (#54)
+
 ## [0.5.1] - 2026-01-02
 
 ### Changed

secretspec/src/provider/lastpass.rs

@@ -348,7 +348,7 @@ impl Provider for LastPassProvider {
     /// Creates or updates a secret in LastPass at the path
     /// determined by the folder_prefix format string. The method first checks if
     /// the item exists to determine whether to use `lpass edit` (for updates)
-    /// or `lpass set` (for new items).
+    /// or `lpass add` (for new items).
     ///
     /// # Arguments
     ///
@@ -409,9 +409,9 @@ impl Provider for LastPassProvider {
                 ));
             }
         } else {
-            // Create new item using lpass set
+            // Create new item using lpass add
             let args = vec![
-                "set",
+                "add",
                 "--sync=now",
                 &item_name,
                 "--password",