Launch games in full screen when object class is detected

Games currently launch when a user shows a specific object to the camera, but they don't open in full screen mode. Each game should take over the entire display when activated.

**Note:** DemonQuest already has a `--fullscreen` argument (`quest_projection.py`), but other games and the launcher need this as well.

**Affected games:** TrainClassifier, SimpleHunt, TileShuffle, DemonQuest (launcher integration)

Start with quest_projection.py, where DemonQuest already accepts --fullscreen, and trace how the launcher activates each affected game. Inspect the launch paths for TrainClassifier, SimpleHunt, TileShuffle, and DemonQuest, then verify that every activated game takes over the entire display.

Written by the indexing model from the issue text.