fix(terrain-variation): 变异布置连通片隔离——新片禁与其他已布片 8 邻贴接（R3 随机流下暴露的粘连合流 bug，单片 ≤pack_max 断言回归）；registry variant_place 黄金向量按 R3 公式重登记 5785725196205023206

prototypes/dungeon-sweeper-vertical-slice/core/battle_orchestrator.gd

@@ -193,28 +193,42 @@ func _place_variants(board: BoardData) -> void:
 		var pack_size: int = mini(total - placed.size(), stream.randi_range(2, int(db.variation.pack_max)))
 		var free: Array = []
 		for c in candidates:
-			if not placed.has(c):
-				free.append(c)
+			# 新片种子/生长格禁与其他已布片 8 邻贴接——否则两片粘连成一个超 pack_max 的连通分量
+			# （R3 随机流下实测暴露：独立生长的相邻片合流击穿单片上限断言）
+			if placed.has(c) or _adjacent_to_packs(board, placed, c):
+				continue
+			free.append(c)
 		if free.is_empty():
 			break
 		var seed_c: Vector2i = free[stream.randi_range(0, free.size() - 1)]
 		placed[seed_c] = true
 		var pack: Array = [seed_c]
+		var pack_set := {seed_c: true}
 		while pack.size() < pack_size:
 			var fringe: Array = []
 			for c in pack:
 				for n in board.neighbors8(c):
-					if candidates.has(n) and not placed.has(n) and not fringe.has(n):
+					if candidates.has(n) and not placed.has(n) and not fringe.has(n) \
+							and not _adjacent_to_packs(board, placed, n, pack_set):
 						fringe.append(n)
 			if fringe.is_empty():
 				break   # 生长域耗尽——该片就地收束（数量不足总目标为合法态，候选域碎片化时触发）
 			var nxt: Vector2i = fringe[stream.randi_range(0, fringe.size() - 1)]
 			placed[nxt] = true
+			pack_set[nxt] = true
 			pack.append(nxt)
 	for c in placed.keys():
 		board.variants[c] = [String(vrow.variant_id)]
 
 
+# 候选格是否与其他已布片（own_pack 之外的 placed 格）8 邻贴接——片间隔离保证连通分量 = 单片 ≤ pack_max
+func _adjacent_to_packs(board: BoardData, placed: Dictionary, c: Vector2i, own_pack: Dictionary = {}) -> bool:
+	for m in board.neighbors8(c):
+		if placed.has(m) and not own_pack.has(m):
+			return true
+	return false
+
+
 # ---- 事件缓冲（轮 facts 收集；结算触发 = Waiting 相位编排点，不依赖到达序）----
 
 func _on_cell_revealed(evt: Dictionary) -> void: