Flatten directory structure and update documentation

- Moved all files from mac_os/ subdirectory to repository root
- Updated README.adoc to reflect simplified architecture
- Updated QUICK_INSTALL.md with all current apps
- Added claude-cli to install.sh and bin/install_homebrew_formulas
- Repository now shows clean file structure without nested mac_os folder
- Documentation now accurately describes opinionated installer approach

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

lib/utilities.sh

@@ -0,0 +1,63 @@
+#! /usr/bin/env bash
+
+# Defines general utility functions.
+
+# Label: Caffeinate Machine
+# Description: Keep machine running for a very long time.
+caffeinate_machine() {
+  if [[ -n "$(pgrep -x caffeinate)" ]]; then
+    printf "Machine is already caffeinated!\n"
+  else
+    caffeinate -s -u -d -i -t 3153600000 > /dev/null &
+    printf "Machine caffeinated.\n"
+  fi
+}
+export -f caffeinate_machine
+
+# Label: Clean Work Path
+# Description: Clean work path of artifacts.
+clean_work_path() {
+  rm -rf "$MAC_OS_WORK_PATH"
+}
+export -f clean_work_path
+
+# Label: Get Basename
+# Description: Answer file or directory basename.
+# Parameters: $1 (required): Path.
+get_basename() {
+  printf "%s" "${1##*/}"
+}
+export -f get_basename
+
+# Label: Get Homebrew Root
+# Description: Answer Homebrew root path.
+get_homebrew_root() {
+  if [[ "$(/usr/bin/arch)" == "arm64" ]]; then
+    printf "%s" "/opt/homebrew"
+  else
+    printf "%s" "/usr/local/Homebrew"
+  fi
+}
+export -f get_homebrew_root
+
+# Label: Get Homebrew Bin Root
+# Description: Answer Homebrew binary root path.
+get_homebrew_bin_root() {
+  if [[ "$(/usr/bin/arch)" == "arm64" ]]; then
+    printf "%s" "/opt/homebrew/bin"
+  else
+    printf "%s" "/usr/local/bin"
+  fi
+}
+export -f get_homebrew_bin_root
+
+# Label: Check Mac App Store Install
+# Description: Check Mac App Store (mas) CLI has been installed.
+check_mas_install() {
+  if ! command -v mas > /dev/null; then
+    printf "%s\n" "ERROR: Mac App Store (mas) CLI can't be found."
+    printf "%s\n" "       Please ensure mas (i.e. brew install mas) is installed."
+    exit 1
+  fi
+}
+export -f check_mas_install