fabric-ai: add shell completions

Author: LangLangBart

Formula/f/fabric-ai.rb

@@ -18,6 +18,10 @@ class FabricAi < Formula
 
   def install
     system "go", "build", *std_go_args(ldflags: "-s -w"), "./cmd/fabric"
+    # Install completions
+    bash_completion.install "completions/fabric.bash" => "fabric-ai"
+    fish_completion.install "completions/fabric.fish" => "fabric-ai.fish"
+    zsh_completion.install "completions/_fabric" => "_fabric-ai"
   end
 
   test do