Vendor libs/hump, sfxrlua, json4lua, narrator as real files

These were committed as empty submodule gitlinks with no .gitmodules,
so the folders were never populated and the game could not load
(require of libs/hump/timer, libs/sfxrlua/sfxr, narrator.narrator).
Checked out each at its pinned commit and vendored the files, matching
the existing bundled-libs convention. Removed the junk libs/libs/ tree.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

libs/narrator/test/units/lists-basic.ink

@@ -0,0 +1,57 @@
+LIST daysOfTheWeek = Monday, Tuesday, Wednesday, Thursday, Friday
+VAR today = Monday
+VAR tomorrow = Tuesday
+
+LIST heatedWaterStates = cold, boiling, recently_boiled
+VAR kettleState = cold
+VAR potState = cold
+
+LIST colours = red, green, blue, purple
+LIST moods = mad, happy, blue
+VAR status = colours.blue
+
+LIST volumeLevel = off, quiet, medium, loud, deafening
+VAR lecturersVolume = quiet
+VAR murmurersVolume = quiet
+
+LIST Numbers = one, two, three
+VAR cats = one
+
+~ cats = Numbers(2) // score will be "two"
+We have { cats } cats.
+
+-> today
+== today
+
+Today is { today }. Tomorrow is { tomorrow }.
+
+...
+-> kitchen
+=== kitchen
+
+
+- Hm, kettle is { kettleState } and pot is { potState }.
+~ kettleState = boiling
+- Now kettle is { kettleState } and pot is { potState }.
+
+...
+-> status
+=== status
+
+Binary values are { status == colours.blue } and { status == moods.blue }
+
+...
+-> lecture
+=== lecture
+
+{ lecturersVolume < deafening:
+	~ lecturersVolume++
+    The lecturer's voice becomes {lecturersVolume}.
+	The lecturer has {LIST_VALUE(deafening) - LIST_VALUE(lecturersVolume)} notches still available to him.
+
+	{ lecturersVolume > murmurersVolume:
+		~ murmurersVolume++
+		The murmuring gets louder.
+	}
+    -> lecture
+}