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/debug.lua

@@ -0,0 +1,30 @@
+--
+-- Script for debugging in VSCode with
+-- Local Lua Debugger by Tom Blind (https://github.com/tomblind/local-lua-debugger-vscode)
+
+-- Dependencies
+local narrator = require('narrator.narrator')
+local bot = require('bot')
+
+-- Loading
+-- local book = require('stories.debug')
+-- local book = narrator.parseBook('Hello world!', { '=== one === \n text 1', '=== two === \n text 2' })
+local book = narrator.parse_file('stories.debug', { save = false })
+
+local story = narrator.init_story(book)
+local answers = { }
+
+-- Choice instructor for a bot
+local function instructor(choices, step)
+  local answer = answers[step]
+  if answer == nil then
+    math.randomseed(os.time() * 10000000)
+    answer = math.random(1, #choices)
+  end
+  return answer
+end
+
+-- Game
+print('--- Game started ---\n')
+bot.play(story, instructor, { print = true })
+print('\n--- Game over ---')