add update-aur-onebyone.sh: update AUR packages sequentially

Why: yay -Syu rebuilds everything in one go, making a single failure
stall the whole batch. This script iterates per-package so failures
are isolated and reported at the end.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

update-aur-onebyone.sh

@@ -0,0 +1,32 @@
+#!/bin/bash
+
+set -u
+
+mapfile -t pkgs < <(yay -Qua | awk '{print $1}')
+
+if [ ${#pkgs[@]} -eq 0 ]; then
+    echo "No AUR updates available."
+    exit 0
+fi
+
+echo "Found ${#pkgs[@]} AUR package(s) with updates:"
+printf '  %s\n' "${pkgs[@]}"
+echo
+
+failed=()
+for pkg in "${pkgs[@]}"; do
+    echo "==> Updating $pkg"
+    if yay -S --noconfirm --answerdiff None --answerclean All --removemake "$pkg"; then
+        echo "==> $pkg: OK"
+    else
+        echo "==> $pkg: FAILED"
+        failed+=("$pkg")
+    fi
+    echo
+done
+
+if [ ${#failed[@]} -gt 0 ]; then
+    echo "Failed packages:"
+    printf '  %s\n' "${failed[@]}"
+    exit 1
+fi