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/conditions-inline.ink

@@ -0,0 +1,15 @@
+VAR mood = 10
+VAR midnight = true
+
+-> simple
+
+=== simple
+Simple condition: { mood > 20 : Hmm... { mood > 40 : Wow! } I was feeling positive enough. } Okay.
+~ mood += 20
+{ mood > 50 : -> complex | -> simple }
+
+=== complex
+Complex condition with midnight. { midnight : Wow! { midnight : Nice! | Bad! } | { not midnight : Very nice! | Very bad! } This is the end. }
+{ midnight != true : -> END }
+~ midnight = false
+-> complex