tex: add part summary

tex/text.tex

@@ -536,6 +536,15 @@ many more directives and settings than mentioned in this section, the author
 encourages anybody interested to give it a read, e.g.\ at
 \url{https://web.dev/csp/}.
 
+\n{2}{Summary}
+
+Passwords are in use everywhere and probably will be for the foreseeable
+future. As long as passwords are going to be handled and stored by
+service/application providers, they are going to get leaked, be it due to
+provider carelessness or the attackers' resolve. When sifting through all the
+password breach data by hand is not an option, tools should come in to provide
+assistance. The next part will explore that.
+
 
 % =========================================================================== %
 \part{Practical part}