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/functions.ink

@@ -0,0 +1,23 @@
+{foo(): ->continue}
+something wrong 1
+
+-(continue)
+{boo():
+	something wrong 2
+}
+
+sum: {test(2, 3)}
+
+-> END
+
+=== function test(a, b) ===
+first param is {a}
+second param is {b}
+~return a + b
+
+=== function foo() ===
+~return true
+
+=== function boo() ===
+~return
+