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/loop.ink

@@ -0,0 +1,17 @@
+- (opts)
+	*	'Can I get a uniform from somewhere?'[] you ask the cheerful guard.
+		'Sure. In the locker.' He grins. 'Don't think it'll fit you, though.'
+	*	'Tell me about the security system.'
+		'It's ancient,' the guard assures you. 'Old as coal.'
+	*	'Are there dogs?'
+		'Hundreds,' the guard answers, with a toothy grin. 'Hungry devils, too.'
+	// We require the player to ask at least one question
+	*	{loop} [Enough talking]
+		-> done
+- (loop)
+	// loop a few times before the guard gets bored
+	{ -> opts | -> opts | }
+	He scratches his head.
+	'Well, can't stand around talking all day,' he declares.
+- (done)
+	You thank the guard, and move away.