Restructure repo layout and document conventions

Move legacy systemscripts into scripts/display and scripts/setup.
Rehome stray top-level tools into their domain folders.
Archive narrow experiments and outdated codegrab leftovers.
Remove empty legacy directories and stale root files.
Expand macOS metadata ignores and update the README with the refined repository structure.

tools/hashing/sparsecmp.sh

@@ -0,0 +1,50 @@
+#!/bin/bash
+
+# Function to get size of file or block device
+get_size() {
+  if [ -b "$1" ]; then  # Check if input is a block device
+    size=$(sudo blockdev --getsize64 "$1")
+  else  # Assume input is a file
+    size=$(stat --format="%s" "$1")
+  fi
+  echo $size
+}
+
+# Check if at least two arguments are provided
+if [ $# -lt 2 ]; then
+  echo "Usage: $0 <source> <target> [test count]"
+  exit 1
+fi
+
+source="$1"
+target="$2"
+count="${3:-100}"  # Default to 100 tests if not specified
+
+# Ensure the source and target exist
+if [ ! -e "$source" ] || [ ! -e "$target" ]; then
+  echo "Error: Source or target does not exist."
+  exit 1
+fi
+
+size=$(get_size "$source")  # Get size in bytes
+if [ $? -ne 0 ] || [ -z "$size" ] || [ "$size" -eq 0 ]; then
+  echo "Error: Failed to get size of the source."
+  exit 1
+fi
+
+interval=$((size / count))
+
+for ((i=0; i<count; i++)); do
+  offset=$((i * interval))
+  percent=$((i * 100 / count))
+  # Use printf to overwrite the current line with the offset and percentage
+  printf "\r%$(tput cols)s\rComparing at offset $offset... (${percent}%%)"
+  if ! cmp --bytes=1M "$source" "$target" --ignore-initial=$offset > /dev/null 2>&1; then
+    echo -e "\nMismatch or error at offset $offset"
+    exit 1  # Exit after the first mismatch
+  fi
+done
+
+# Clear the line after the loop finishes successfully and print success message
+printf "\r%$(tput cols)s\r"
+echo "No mismatches found."