New game / Load of the running game re-enter it in place only while it still
matches its collection; after the player edited the collection the mod set is
switched, so added mechanics (the editors) appear. Test suite collection_edit.
The novel template becomes the intended layering: collection novel_template
lists my_novel_game (its own scenes, scenarios, text), town_pack (reusable
backgrounds and the bar ambience) and the engine. The town entrance and the
home vestibule move from cthangover_game into town_pack instead of being
copied; cthangover_game depends on it. Docs explain how to start a game from
these three layers.
The mod holding the main game's own scenes and story follows the <game>_game
naming rule; further parts stay <game>_<part>, reusable content is <theme>_pack.
Mods are renamed by role (shell2d_base, menu_base, ui_base, live2d_base,
editor_tools, cthangover_story, cthangover_murakami, cthangover_party) and
every reference follows. Engine UI prefabs (dialog, answers, message, game
menu, inventory, map, skills) and their panel entries moved out of the story
mod into the subsystem mods; the card_novel and vn_starter_novel collections
are removed.