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/hump/docs/index.rst

@@ -0,0 +1,59 @@
+**hump** - Helper Utilities for a Multitude of Problems
+=======================================================
+
+**hump** is a set of lightweight helpers for the awesome `LÖVE
+<http://love2d.org>`_ game framework.
+It will help to get you over the initial hump when starting to build a new
+game.
+
+**hump** does nothing that you couldn't do yourself.
+But why should you?
+You want to write games, not boilerplate!
+
+**hump**'s components are so loosely coupled that every component is
+independent of the others.
+You can choose what you need and leave the rest behind.
+hump won't judge.
+
+**hump** just wants to make you happy.
+
+Read on
+-------
+
+.. toctree::
+   :maxdepth: 2
+
+   hump.gamestate <gamestate>
+   hump.timer <timer>
+   hump.vector <vector>
+   hump.vector-light <vector-light>
+   hump.class <class>
+   hump.signal <signal>
+   hump.camera <camera>
+   license
+
+
+Get hump
+--------
+
+You can view and download the individual modules on github: `vrld/hump
+<http://github.com/vrld/hump>`_.
+You may also download the whole packed sourcecode either in the `zip
+<http://github.com/vrld/hump/zipball/master>`_ or `tar
+<http://github.com/vrld/hump/tarball/master>`_ format.
+
+Using `Git <http://git-scm.com>`_, you can clone the project by running:
+
+    git clone git://github.com/vrld/hump
+
+Once done, you can check for updates by running
+
+    git pull
+
+
+Indices and tables
+------------------
+
+* :ref:`genindex`
+* :ref:`modindex`
+* :ref:`search`