scripts.modules: shared Lua code

scripts:
  modules:
    - lua/helpers.lua
    - lua/queries.lua

Each listed file is loaded once per worker thread, at global scope, before any transaction runs, and also into the VM of pre_load_script and load_script, so loaders and transactions can share helpers. Use modules for:

• Helper functions shared across transactions.
• Dispatch tables (e.g. Q[1]..Q[22] for PGM-H).
• Constant lookup tables (syllable lists, type names, …).

Anything a module defines as a global is visible to every script-mode transaction on that thread.