feat: set GLOW_STYLE and add glow to go:install:tools

- .zshenv: export GLOW_STYLE pointing to Nord theme JSON
- arty.yml: add glow v2 to go:install:tools

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.zshenv

@@ -15,4 +15,7 @@ plugins=(
 export EDITOR=micro
 
 # Enable TrueColors for micro
-export MICRO_TRUECOLOR=1
+export MICRO_TRUECOLOR=1
+
+# Set custom glow style
+export GLOW_STYLE="$HOME/.config/glow/nord.json"