Technique swapping implementation

src/pirats/main.py

@@ -89,7 +89,9 @@ def get_game_state(game_id: str, player_id: str, db: Session = Depends(get_sessi
         # admin_key stays hidden except from Admins, who need it to open the admin panel
         "game": game.model_dump(exclude=(set() if player.is_admin else {"admin_key"})),
         "player": player.model_dump(),
-        "players": [p.model_dump() for p in game.players],
+        # A swap offer must reveal nothing but its existence: only the offerer
+        # gets to see which technique they put on the table.
+        "players": [p.model_dump(exclude=(set() if p.id == player.id else {"swap_offer_technique"})) for p in game.players],
         "obstacles": [o.model_dump() for o in game.obstacles],
         "challenges": [c.model_dump() for c in game.challenges],
         "votes": [v.model_dump() for v in game.votes],