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-switch.ink

@@ -0,0 +1,78 @@
+VAR foo = false
+VAR x = 0
+
+-> simple
+
+== simple
+{not foo:
+   Hello!
+   }
+{ foo :
+True! -> choice
+- else:
+False! }
+~ foo = not foo
+-> simple
+
+=== choice
+
+{ true :
+    * [Answer] -> nested_inline
+}
+
+== nested_inline
+{
+    - foo : { foo: True! | False! }
+    Text here.
+    - else: Badaboom!
+    ...again. -> nested_block
+}
+~ foo = not foo
+-> nested_inline
+
+
+== nested_block
+I love you. { true:
+    And what about you?
+    {
+        - false:
+            False!
+        - true:
+            * Choice -> tags
+    }
+    ...
+} Something.
+
+== tags
+{
+- not foo:
+    text { true : x = { x } } #success
+- else:
+    -> not_a_label
+}
+~ foo = not foo
+-> tags
+
+== not_a_label
+{
+- foo: suc...
+    success #success
+- x < 0: mid...
+    middle
+    text -> END
+- else: els...
+    (notLabel) else
+    -> switch
+}
+~ foo = not foo
+-> not_a_label
+
+== switch
+{ x:
+- 0: 	zero
+- 1: 	one
+- 2: 	two
+- else: lots -> END
+}
+~ x++
+-> switch