Revert "Drop unrelated privileged heredoc scanner"

This reverts commit 4c23077f80.

test/shell.d/fixtures/privileged-heredoc/hop-twice-home-path.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+
+# Two hops. The scan resolves omarchy_bin into helper, so the value it ends up
+# judging still carries an unresolved $HOME rather than a literal path.
+omarchy_bin="$HOME/.local/share/omarchy/bin"
+helper="$omarchy_bin/omarchy-agent"
+
+# omarchy:heredoc-expands paths=none -- helper names the agent, no path is baked in
+cat <<EOF | sudo tee /etc/udev/rules.d/99-omarchy-agent.rules >/dev/null
+SUBSYSTEM=="power_supply", RUN+="$helper"
+EOF