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/choices-conditional/1-1-1.txt

@@ -0,0 +1,14 @@
+
+>) Go to Paris
+2) Go to London
+
+Hello Paris!
+
+>) Go to London
+2) Go home
+
+Hello London!
+
+>) Go home
+
+Sweet home...

libs/narrator/test/units/choices-conditional/1-2.txt

@@ -0,0 +1,10 @@
+
+>) Go to Paris
+2) Go to London
+
+Hello Paris!
+
+1) Go to London
+>) Go home
+
+Sweet home...

libs/narrator/test/units/choices-conditional/2-1-1.txt

@@ -0,0 +1,14 @@
+
+1) Go to Paris
+>) Go to London
+
+Hello London!
+
+>) Go to Paris
+2) Go home
+
+Hello Paris!
+
+>) Go home
+
+Sweet home...

libs/narrator/test/units/choices-conditional/2-2.txt

@@ -0,0 +1,10 @@
+
+1) Go to Paris
+>) Go to London
+
+Hello London!
+
+1) Go to Paris
+>) Go home
+
+Sweet home...