chore: add script to toggle Cosmoteer's built-in DebugMode

The binary ships a part debugger (OpenPartDebugger, PartDebugValue /
PartDebugToggle / PartDebugTrigger) that can show a part's live component
values -- the only way from inside the game to see why a modded toggle
chain is not firing. It is gated behind the DebugMode setting, which has
no UI in a release build.

The script refuses to run while the game is open, because Cosmoteer
rewrites settings.rules on exit and would discard the change.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_011oLWY1G6S8U35bi2FxVWni

debug_mode.sh

@@ -0,0 +1,61 @@
+#!/usr/bin/env bash
+# ABOUT ME
+# Turns Cosmoteer's built-in DebugMode on or off by editing settings.rules.
+#
+# Why it exists: the game binary contains a part debugger (OpenPartDebugger,
+# PartDebugValue / PartDebugToggle / PartDebugTrigger) which can show a part's
+# live component values. That is the only way to see, from inside the game, why
+# a modded toggle chain is not doing what it should. It is gated behind the
+# DebugMode setting, which has no in-game UI in a release build.
+#
+# Cosmoteer rewrites settings.rules when it exits, so the game must be closed
+# before running this or the change is lost.
+#
+# Usage:  ./debug_mode.sh on
+#         ./debug_mode.sh off
+
+set -euo pipefail
+
+MODE="${1:-}"
+case "$MODE" in
+	on)  VALUE="Normal" ;;
+	off) VALUE="None" ;;
+	*)   echo "Usage: $0 on|off" >&2; exit 1 ;;
+esac
+
+find_settings() {
+	local candidates=(
+		"$HOME"/.local/share/Steam/steamapps/compatdata/799600/pfx/drive_c/users/steamuser/"Saved Games"/Cosmoteer/*/settings.rules
+		/mnt/*/SteamLibrary/steamapps/compatdata/799600/pfx/drive_c/users/steamuser/"Saved Games"/Cosmoteer/*/settings.rules
+		"$HOME"/"Saved Games"/Cosmoteer/*/settings.rules
+		"$HOME"/Documents/"My Games"/Cosmoteer/*/settings.rules
+	)
+	for path in "${candidates[@]}"; do
+		[ -f "$path" ] && printf '%s\n' "$path" && return 0
+	done
+	return 1
+}
+
+SETTINGS="${COSMOTEER_SETTINGS:-$(find_settings || true)}"
+
+if [ -z "$SETTINGS" ]; then
+	echo "Could not find settings.rules. Set COSMOTEER_SETTINGS and run again." >&2
+	exit 1
+fi
+
+if pgrep -f -i cosmoteer >/dev/null 2>&1; then
+	echo "Cosmoteer is running. Quit it first -- it rewrites settings.rules on exit" >&2
+	echo "and would discard this change." >&2
+	exit 1
+fi
+
+[ -f "$SETTINGS.bak-preautorad" ] || cp "$SETTINGS" "$SETTINGS.bak-preautorad"
+
+if grep -qE '^DebugMode = ' "$SETTINGS"; then
+	sed -i "s/^DebugMode = .*/DebugMode = $VALUE/" "$SETTINGS"
+else
+	printf 'DebugMode = %s\n' "$VALUE" >> "$SETTINGS"
+fi
+
+echo "DebugMode = $VALUE"
+echo "Backup at $SETTINGS.bak-preautorad"