Wraps lowertext() to ensure proper stringification. (#82442)

## About The Pull Request

Fixes #82440

This PR just creates a new macro, `LOWER_TEXT()` (yes the irony is not
lost on me) to wrap around all calls of `lowertext()` and ensure that
whatever we input into that proc will be stringified using the `"[]"`
(or `tostring()` for the nerds) operator. very simple.

I also added a linter to enforce this (and prevent all forms of
regression) because I think that machines should do the menial work and
we shouldn't expect maintainers to remember this, let me know if you
disagree. if there is a time when it should be opted out for some
reason, the linter does respect it if you wrap your input with the
`UNLINT()` function.

code/datums/memory/_memory.dm

@@ -392,7 +392,7 @@
 
 	if(istype(character, /datum/mind))
 		var/datum/mind/character_mind = character
-		return "\the [lowertext(initial(character_mind.assigned_role.title))]"
+		return "\the [LOWER_TEXT(initial(character_mind.assigned_role.title))]"
 
 	// Generic result - mobs get "the guy", objs / turfs get "a thing"
 	return ismob(character) ? "\the [character]" : "\a [character]"