docs: implementation plan for main menu + save/load
13 TDD tasks: GameSession + delegation, restore hooks, GameIO.choose, SaveData/SaveCodec/SaveService (JSON), Settings + mutable ConsoleIO, menu package, save/menu commands, quest autosave, App shell loop, SwingIO buttons, docs. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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