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/narrator/annotations.lua

@@ -0,0 +1,37 @@
+---@class Narrator.Book.Version
+---@field engine number
+---@field tree number
+
+---@class Narrator.Book
+---@field version Narrator.Book.Version
+---@field inclusions string[]
+---@field lists table
+---@field constants table
+---@field variables table
+---@field params table
+---@field tree table
+
+---@class Narrator.ParsingParams
+---@field save boolean Save a parsed book to the lua file
+
+---@class Narrator.Paragraph
+---@field text string
+---@field tags string[]|nil
+
+---@class Narrator.Choice
+---@field text string
+---@field tags string[]|nil
+
+---@class Narrator.State
+---@field version number
+---@field temp table
+---@field seeds table
+---@field variables table
+---@field params table|nil
+---@field visits table
+---@field current_path table
+---@field paragraphs table
+---@field choices table
+---@field output table
+---@field tunnels table|nil
+---@field path table