Wood: giant mushrooms underground, felled by imps; wooden bridges and doors cost wood

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

src/traps.rs

@@ -178,6 +178,12 @@ impl Game {
             self.sfx_ui(Sfx::Error);
             return;
         }
+        // a wooden door costs wood
+        if kind == TrapKind::WoodDoor && !self.spend_wood(crate::wood::DOOR_WOOD) {
+            self.msg("msg.no_wood", vec![]);
+            self.sfx_ui(Sfx::Error);
+            return;
+        }
         let id = self.next_id;
         self.next_id += 1;
         self.traps.push(Trap { id, kind, tile: i, stage: ORDERED, crate_tile: 0, progress: 0.0, cd: 0.0, hp: kind.hp(), locked: false, carrier: 0, fired: 99.0, aim: 0.0, revealed: false, sprung: false });