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/bot.lua

@@ -0,0 +1,63 @@
+--
+-- Bot for story playing
+
+local bot = { }
+
+--- Play a story by bot
+-- @param story Story: a story instance
+-- @param instructor function: function that will be return the answer index
+-- @param params.print boolean: print a game log to console or not, false by default
+-- @return string: a log of the game
+function bot.play(story, instructor, params)
+  local params = params or { print = false }
+
+  local log = { }
+  local step = 1
+
+  local function output(text)
+    if params.print then print(text) end
+    table.insert(log, text)
+  end
+
+  story:begin()
+
+  while story:can_continue() or story:can_choose() do
+    local paragraphs = story:continue()
+    for _, paragraph in ipairs(paragraphs or { }) do
+      local text = paragraph.text or ''
+      if paragraph.tags then
+        local hashtag = #text > 0 and ' #' or '#'
+        text = text .. hashtag .. table.concat(paragraph.tags, ' #')
+      end
+      output(text)
+    end
+
+    if not story:can_choose() then break end
+
+    local choices = story:get_choices()
+    local answer = instructor(choices, step)
+    step = step + 1
+
+    -- Check for a signal to emergency exit
+    if answer == -1 then
+      return nil
+    end
+
+    output('')
+    for i, choice in ipairs(choices) do
+      local prefix = (i == answer and '>' or i) .. ') '
+      local text = prefix .. choice.text
+      if choice.tags then
+        text = text .. ' #' .. table.concat(choice.tags, ' #')
+      end
+      output(text)
+    end
+    output('')
+
+    story:choose(answer)
+  end
+
+  return table.concat(log, '\n')
+end
+
+return bot