Rename constructor to game.New(game.Params) per styleguide

NewGame(Config) becomes New(Params), and Restore takes Params too, so
the package's primary type gets the canonical New() constructor with a
named-field Params struct (styleguide points 139, 159). cmd/rogue and
all tests updated; ARCHITECTURE.md constructor references corrected.
Pure rename, suite green.

game/save.go

@@ -681,7 +681,7 @@ var ErrSaveOutOfDate = errors.New("sorry, saved game is out of date")
 
 // Restore restores a saved game from a file (save.c restore). The file is
 // deleted, as in C, to defeat restarting from the same save.
-func Restore(path string, cfg Config) (*RogueGame, error) {
+func Restore(path string, params Params) (*RogueGame, error) {
 	f, err := os.Open(path) //nolint:gosec // G304: the save path is user-chosen by design
 	if err != nil {
 		return nil, err
@@ -704,12 +704,12 @@ func Restore(path string, cfg Config) (*RogueGame, error) {
 		data:      newGameData(),
 		Rng:       &Rng{},
 		Playing:   true,
-		ScorePath: cfg.ScorePath,
+		ScorePath: params.ScorePath,
 		FileName:  path,
-		rogueOpts: cfg.RogueOpts,
+		rogueOpts: params.RogueOpts,
 		restored:  true,
 	}
-	g.scr = NewScreen(cfg.Term)
+	g.scr = NewScreen(params.Term)
 	g.Msgs.attach(g.scr, g.look, g.readchar)
 	g.applySnapshot(&st)