Add StandardRB and get some fixes

Gemfile.lock

@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    picopackage (0.2.0)
+    picopackage (0.2.1)
       digest
       open-uri (~> 0.5)
       yaml (~> 0.4)
@@ -14,22 +14,27 @@ GEM
     debug (1.10.0)
       irb (~> 1.10)
       reline (>= 0.3.8)
-    digest (3.1.1)
+    digest (3.2.0)
     io-console (0.8.0)
-    irb (1.14.3)
+    irb (1.15.1)
+      pp (>= 0.6.0)
       rdoc (>= 4.0.0)
       reline (>= 0.4.2)
     json (2.9.1)
     language_server-protocol (3.17.0.3)
+    lint_roller (1.1.0)
     minitest (5.25.4)
     open-uri (0.5.0)
       stringio
       time
       uri
     parallel (1.26.3)
-    parser (3.3.6.0)
+    parser (3.3.7.0)
       ast (~> 2.4.1)
       racc
+    pp (0.6.2)
+      prettyprint
+    prettyprint (0.2.0)
     psych (5.2.3)
       date
       stringio
@@ -53,7 +58,22 @@ GEM
       unicode-display_width (>= 2.4.0, < 4.0)
     rubocop-ast (1.37.0)
       parser (>= 3.3.1.0)
+    rubocop-performance (1.23.1)
+      rubocop (>= 1.48.1, < 2.0)
+      rubocop-ast (>= 1.31.1, < 2.0)
     ruby-progressbar (1.13.0)
+    standard (1.44.0)
+      language_server-protocol (~> 3.17.0.2)
+      lint_roller (~> 1.0)
+      rubocop (~> 1.70.0)
+      standard-custom (~> 1.0.0)
+      standard-performance (~> 1.6)
+    standard-custom (1.0.2)
+      lint_roller (~> 1.0)
+      rubocop (~> 1.50)
+    standard-performance (1.6.0)
+      lint_roller (~> 1.1)
+      rubocop-performance (~> 1.23.0)
     stringio (3.1.2)
     time (0.4.1)
       date
@@ -73,6 +93,7 @@ DEPENDENCIES
   picopackage!
   rake (~> 13.0)
   rubocop (~> 1.21)
+  standard (~> 1.44)
 
 BUNDLED WITH
    2.6.2