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/1-2-2.txt

@@ -0,0 +1,19 @@
+
+>) 'Can I get a uniform from somewhere?'
+2) 'Tell me about the security system.'
+3) 'Are there dogs?'
+
+'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.'
+
+1) 'Tell me about the security system.'
+>) 'Are there dogs?'
+3) Enough talking
+
+'Are there dogs?'
+'Hundreds,' the guard answers, with a toothy grin. 'Hungry devils, too.'
+
+1) 'Tell me about the security system.'
+>) Enough talking
+
+You thank the guard, and move away.