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/alts-blocks.ink

@@ -0,0 +1,60 @@
+VAR counter = 1
+-> casino
+
+= casino
+=== { counter }
+At the table, I drew a card. <>
+{ stopping:
+    -
+    I entered the casino.
+	-  Okay. <>
+    I entered the casino again.
+	-  { counter }. <>
+
+    Once more, I went inside.
+}
+~ counter++
+{ counter < 5 : -> casino | -> cycle }
+
+= cycle
+=== { counter }
+{ cycle:
+	- I held my breath.
+	- I waited impatiently.
+	- I paused.
+}
+~ counter++
+{ counter < 9: -> cycle | -> once }
+
+= once
+=== { counter }
+{ once:
+	- Would my luck hold?
+	- Could I win the hand?
+}
+~ counter++
+{ counter < 13 : -> once | -> shuffle }
+
+= shuffle
+=== { counter }
+{ SEED_RANDOM(counter - 13) }
+At the table, I drew a card. <>
+{ shuffle:
+	- 	Ace of Hearts.
+	- 	King of Spades.
+	- 	2 of Diamonds.
+		'You lose this time!' crowed the croupier.
+}
+~ counter++
+{ counter < 16 : -> shuffle | -> nested }
+
+= nested
+=== { counter }
+{ SEED_RANDOM(counter - 16) }
+{ true:
+    { shuffle:
+    - Okay. Ace of Hearts again.
+    - Okay. Ace of Hearts?!
+    }
+}
+-> END