feat: add Godot Agones REST bridge

Game/scripts/server_boot.gd

@@ -2,6 +2,7 @@ extends Node
 
 const NetCodec = preload("res://scripts/net_codec.gd")
 const ServerControlScript = preload("res://scripts/server_control.gd")
+const AgonesSDKScript = preload("res://scripts/agones_sdk.gd")
 
 # Headless dedicated server entry point (task 1.6). Parses CLI args, hosts
 # via NetworkManager, logs structured lines, and watches for physics-tick
@@ -28,6 +29,7 @@ var _last_physics_frame := 0
 var config: ServerConfig = null
 var _watchdog_armed := false   # skip the first _process(): engine startup scheduling can batch several physics frames before the first idle frame runs, which isn't a real overrun
 var _control: ServerControl = null
+var _agones = null
 var _drain_requested := false
 
 
@@ -89,6 +91,11 @@ func _ready() -> void:
 			printerr("cosmic-clash-server: refusing to start with invalid readiness control port")
 			get_tree().quit(1)
 			return
+		_agones = AgonesSDKScript.new()
+		_agones.name = "AgonesSDK"
+		get_tree().root.add_child.call_deferred(_agones)
+		if _agones.configure_from_environment():
+			_agones.start_health()
 
 	NetworkManager.client_connected.connect(_on_client_connected)
 	NetworkManager.client_disconnected.connect(_on_client_disconnected)