Phase 7: Windows client export, preset fix, code fixes

- Fix: export_presets.cfg — platform='Windows Desktop' (not 'Windows'), Windows as [preset.0]
- Fix: plugin_manager.gd — removed class_name (autoload conflict), fixed multiline % formatting
- Fix: Disabled GDExtension temporarily for clean export
- Add: Windows PE32+ x86_64 client binary (109MB) at build/tactical-shooter-windows-x86_64/
- Add: tactical-shooter-windows.zip (portable zip package)
- Build: Linux server binary (78MB) rebuilt

scripts/network/server_main.gd

@@ -7,9 +7,11 @@
 ##   1. Load config (env overrides)
 ##   2. Load the first map from the config's map rotation
 ##   3. Start ENet server on the configured port
-##   4. Spawn players on the map using spawn markers
-##   5. Broadcast spawn via RPC so clients create visual player nodes
-##   6. Log player join/leave and replicate position
+##   4. Create GameServer and start simulation
+##   5. Spawn players on the map using spawn markers
+##   6. Broadcast spawn via RPC so clients create visual player nodes
+##   7. Log player join/leave and replicate position
+##   8. Hitscan weapon with lag compensation runs in GameServer
 
 extends Node
 
@@ -31,6 +33,9 @@ var players: Dictionary = {}  # peer_id → Node (player instance)
 var spawn_points_a: Array[Vector3] = []  # Team A spawns
 var spawn_points_b: Array[Vector3] = []  # Team B spawns
 
+# Game server (drives simulation)
+var _game_server: Node = null
+
 # ---------------------------------------------------------------------------
 # Lifecycle
 # ---------------------------------------------------------------------------
@@ -42,21 +47,27 @@ func _ready() -> void:
 	if OS.has_environment("SERVER_PORT"):
 		effective_port = int(OS.get_environment("SERVER_PORT"))
 		print("[ServerMain] Port overridden by SERVER_PORT env: %d" % effective_port)
-	
+
+	# Create GameServer (drives the 128Hz simulation + hit detection)
+	_game_server = preload("res://server/scripts/game_server.gd").new()
+	add_child(_game_server)
+	# GameServer registers SimulationServer as a singleton on _ready
+	_game_server.start_simulation()
+
 	# Instance the map from the config's map rotation
 	_load_map()
-	
+
 	# Start the ENet server
 	var err: Error = NetworkManager.start_server(effective_port)
 	if err != OK:
 		push_error("[ServerMain] Failed to start server: %s" % error_string(err))
 		get_tree().quit(1)
 		return
-	
+
 	# Connect signals
 	NetworkManager.player_connected.connect(_on_player_connected)
 	NetworkManager.player_disconnected.connect(_on_player_disconnected)
-	
+
 	print("[ServerMain] Tactical Shooter server ready")
 	print("[ServerMain]   Port:       %d" % effective_port)
 	print("[ServerMain]   Name:       \"%s\"" % ServerConfig.server_name)
@@ -64,6 +75,7 @@ func _ready() -> void:
 	print("[ServerMain]   Maps:       %s" % ServerConfig.map_list)
 	print("[ServerMain]   Headless:   %s" % (DisplayServer.get_name() == &"headless"))
 	print("[ServerMain]   Spawn pts:  Team A=%d, Team B=%d" % [spawn_points_a.size(), spawn_points_b.size()])
+	print("[ServerMain]   Lag comp:   Enabled (64-tick history = %dms)" % [64.0 * 1000.0 / ServerConfig.tick_rate])
 
 func _exit_tree() -> void:
 	NetworkManager.stop()
@@ -137,36 +149,50 @@ func _spawn_player(peer_id: int) -> void:
 	else:
 		player = Node3D.new()
 		player.set_script(preload("res://scripts/network/player.gd"))
-	
+
 	player.name = "Player_%d" % peer_id
 	player.set_multiplayer_authority(peer_id)
-	
+
 	# Assign spawn position — alternate between Team A and Team B spawns
 	var is_team_a: bool = (peer_id % 2) == 0
 	var pool: Array[Vector3] = spawn_points_a if is_team_a else spawn_points_b
 	var spawn_pos: Vector3 = pool[peer_id % pool.size()] if pool.size() > 0 else Vector3.ZERO
 	spawn_pos.y = 0.0
 	player.position = spawn_pos
-	
+
 	add_child(player, true)
 	players[peer_id] = player
 	player_spawned.emit(peer_id)
-	
+
+	# Register with GameServer to get a simulation entity
+	if _game_server != null and _game_server.has_method(&"spawn_player_entity"):
+		var entity_id: int = _game_server.spawn_player_entity(peer_id, spawn_pos)
+		if entity_id >= 0:
+			# Store entity_id on player node for reference
+			player.set_meta(&"entity_id", entity_id)
+			print("[ServerMain] Player %d assigned entity %d" % [peer_id, entity_id])
+
 	# Broadcast spawn to all clients so they create a visual player node
 	NetworkManager.broadcast_spawn_player.rpc(peer_id, spawn_pos, is_team_a)
-	
+
 	print("[ServerMain] Spawned player %d at (%.1f, %.1f) team=%s" % [peer_id, spawn_pos.x, spawn_pos.z, "A" if is_team_a else "B"])
 
 func _despawn_player(peer_id: int) -> void:
 	if peer_id in players:
 		var player: Node = players[peer_id]
+
+		# Despawn entity from GameServer
+		if _game_server != null and player.has_meta(&"entity_id"):
+			var entity_id: int = player.get_meta(&"entity_id")
+			_game_server.despawn_player_entity(entity_id)
+
 		player.queue_free()
 		players.erase(peer_id)
 		player_despawned.emit(peer_id)
-		
+
 		# Broadcast despawn to all clients
 		NetworkManager.broadcast_despawn_player.rpc(peer_id)
-		
+
 		print("[ServerMain] Despawned player %d" % peer_id)
 	else:
 		# Still broadcast even if server doesn't have the player