Add opencode installation to setup.sh

bin/.local/bin/setup.sh

@@ -122,6 +122,19 @@ aur_install_if_possible() {
     fi
 }
 
+install_opencode() {
+    if have opencode; then
+        log "opencode already installed"
+        return 0
+    fi
+    if have npm; then
+        log "Installing opencode via npm..."
+        npm install -g opencode-ai
+    else
+        log "Skipping opencode (npm not found)"
+    fi
+}
+
 ensure_brew() {
     if have brew; then return 0; fi
     log "Homebrew not found; installing Homebrew..."
@@ -236,6 +249,8 @@ fedora)
         log "Optional: Slack via Flatpak"
         sudo flatpak install -y flathub com.slack.Slack || true
     fi
+
+    install_opencode
     ;;
 
 arch)
@@ -249,6 +264,8 @@ arch)
     pacman_install_best_effort "${ARCH_EXTRAS[@]}"
 
     aur_install_if_possible google-chrome slack-desktop || true
+
+    install_opencode
     ;;
 
 macos)
@@ -265,6 +282,8 @@ macos)
         log "Tip: run fzf install helper if you want keybindings/completion:"
         echo "  $(brew --prefix)/opt/fzf/install"
     fi
+
+    install_opencode
     ;;
 
 freebsd)