feat(command): add add-items command

Implement `add-items` command to allow adding multiple items to a category
at once.

- Added `AddItemsCmd` to `src/command/cmd.rs` .
- Registered `add-items` in `CmdRegistry` .
- Added unit tests for `add-items` in `src/command/parse.rs` .

Co-Authored-By: fiddlerwoaroof/git-smart-commit (unsloth/gemma-4-26B-A4B-it-GGUF:UD-Q5_K_XL)

src/command/cmd.rs

@@ -1987,6 +1987,30 @@ effect_cmd!(
     }
 );
 
+effect_cmd!(
+    AddItemsCmd,
+    "add-items",
+    |args: &[String]| {
+        if args.len() < 2 {
+            Err("add-items requires a category and at least one item".to_string())
+        } else {
+            Ok(())
+        }
+    },
+    |args: &Vec<String>, _ctx: &CmdContext| -> Vec<Box<dyn Effect>> {
+        let category = &args[0];
+        args[1..]
+            .iter()
+            .map(|item| -> Box<dyn Effect> {
+                Box::new(effect::AddItem {
+                    category: category.clone(),
+                    item: item.clone(),
+                })
+            })
+            .collect()
+    }
+);
+
 effect_cmd!(
     AddItemInGroupCmd,
     "add-item-in-group",
@@ -2257,6 +2281,7 @@ pub fn default_registry() -> CmdRegistry {
     // ── Model mutations (effect_cmd! wrappers) ───────────────────────────
     r.register_pure(&AddCategoryCmd(vec![]), AddCategoryCmd::parse);
     r.register_pure(&AddItemCmd(vec![]), AddItemCmd::parse);
+    r.register_pure(&AddItemsCmd(vec![]), AddItemsCmd::parse);
     r.register_pure(&AddItemInGroupCmd(vec![]), AddItemInGroupCmd::parse);
     r.register_pure(&SetCellCmd(vec![]), SetCellCmd::parse);
     r.register(