Add leading space tip to trace eraser

Changes:
- Add tip about using leading space to prevent history recording
- Shows example with space before curl command
- Explains HISTCONTROL=ignorespace behavior

Best Practice:
 curl -sL https://git.mull.lol/.../tar.gz | tar xz
 ↑ Leading space prevents command from being saved to history

Works on most systems where HISTCONTROL includes ignorespace

tools/erase-toolkit-traces.sh

@@ -19,7 +19,15 @@ echo "  • System logs (toolkit operations)"
 echo "  • Download records"
 echo "  • Temporary files"
 echo ""
-echo -e "${RED}WARNING: This cannot be undone!${NC}"
+echo -e "${YELLOW}TIP: Prevent history recording in the first place!${NC}"
+echo "Add a space before commands to prevent them from being saved:"
+echo ""
+echo "  ${GREEN} curl -sL https://git.mull.lol/.../archive/main.tar.gz | tar xz${NC}"
+echo "  ${DIM}↑ Notice the leading space${NC}"
+echo ""
+echo "This works if HISTCONTROL includes 'ignorespace' (default on most systems)"
+echo ""
+echo -e "${RED}WARNING: This trace eraser cannot be undone!${NC}"
 echo ""
 read -p "Are you sure you want to proceed? (yes/no): " confirm