Classes become trades; building costs draw on every trade

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

app.py

@@ -117,7 +117,7 @@ def player_view(world: dict, player: dict, now: float) -> dict:
     view["times"] = {action["id"]: game.action_time(world, player, action) for action in game.ACTIONS}
     view["blocked"] = {action["id"]: game.can_start(world, player, action) for action in game.ACTIONS}
     view["drill_per_action"] = game.drill_per_action(player)
-    view["recon_gain"] = {action["id"]: game.recon_gain(world, action) for action in game.ACTIONS
+    view["recon_gain"] = {action["id"]: game.recon_gain(world, player, action) for action in game.ACTIONS
                           if action.get("special") == "recon"}
     return view
 
@@ -361,6 +361,15 @@ class Handler(BaseHTTPRequestHandler):
             return None
         if path == "/api/favour":
             return game.spend_favour(world, player, str(body.get("kind")), now)
+        if path == "/api/class":
+            cls = body.get("cls")
+            if not player.get("repick"):
+                return "You've already chosen your trade"
+            if cls not in game.CLASSES:
+                return "Pick a class"
+            player["cls"], player["repick"] = cls, False
+            game.log(world, now, "join", f"{player['name']} took up the {game.CLASSES[cls]['name'].lower()}'s trade", player["id"])
+            return None
         if path == "/api/perk":
             return game.buy_perk(player, str(body.get("perk")))
         if path == "/api/settings":