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/game.lua

@@ -0,0 +1,60 @@
+--
+-- A simple command-line game example
+
+-- Dependencies
+local narrator = require('narrator.narrator')
+
+-- Parse a book from the Ink file and save as module 'stories.game.lua'
+local book = narrator.parse_file('stories.game', { save = true })
+
+-- Init a story from the book
+local story = narrator.init_story(book)
+
+-- Start observing the Ink variable 'x'
+story:observe('x', function(x) print('The x did change! Now it\'s ' .. x) end)
+
+-- Bind local functions to call from ink as external functions
+story:bind('beep', function() print('Beep! 😃') end)
+story:bind('sum', function(x, y) return x + y end)
+
+-- Begin the story
+story:begin()
+
+print('--- Game started ---\n')
+
+while story:can_continue() do
+
+  -- Get current paragraphs to output
+  local paragraphs = story:continue()
+
+  for _, paragraph in ipairs(paragraphs) do
+    local text = paragraph.text
+
+    -- You can handle tags as you like, but we attach them to text here.
+    if paragraph.tags then
+      text = text .. ' #' .. table.concat(paragraph.tags, ' #')
+    end
+
+    -- Output text to the player
+    print(text)
+  end
+
+  -- If there is no choice, it seems the game is over
+  if not story:can_choose() then break end
+  print('')
+
+  -- Get available choices and output them to the player
+  local choices = story:get_choices()
+  for i, choice in ipairs(choices) do
+    print(i .. ') ' .. choice.text)
+  end
+
+  -- Read the choice from the player input
+  local answer = tonumber(io.read()) or 0
+  print('')
+
+  -- Send an answer to the story to generate new paragraphs
+  story:choose(answer)
+end
+
+print('\n--- Game over ---')