Refactor first-boot rotation setup to use kernel command line for persistent display rotation. Update documentation to clarify the new method of setting screen orientation (90° clockwise) via cmdline.txt, eliminating the need for one-shot scripts. Enhance logging and user guidance for rotation and wallpaper configuration during first boot.

emmc-provisioning/cloud-init/set-rotation-at-login.sh

@@ -0,0 +1,13 @@
+#!/bin/bash
+# Set reTerminal DM (labwc/Wayland) rotation to Left at every login.
+# Runs from autostart when user pi logs in; does not remove itself.
+# Use this when wlr-randr transform does not persist across reboots.
+sleep 5
+OUTPUT=""
+if command -v wlr-randr &>/dev/null; then
+  OUTPUT=$(wlr-randr 2>/dev/null | awk '/^[A-Za-z0-9_-]+ /{print $1; exit}')
+fi
+[[ -z "$OUTPUT" ]] && OUTPUT="DSI-1"
+if [[ -n "$OUTPUT" ]] && command -v wlr-randr &>/dev/null; then
+  wlr-randr --output "$OUTPUT" --transform 270
+fi