fix(session): separate forced disconnects from resume parking

Add a forced dispose path for bans, RCON disconnects, logout/account endpoints, plugin-cancelled login, duplicate login replacement, and late MAC-ban enforcement. Soft channel closes still park a session for reconnect, while security-driven closes now bypass session resume. Also null-guard client/channel disposal and cover the contract with focused tests.

Emulator/src/test/java/com/eu/habbo/habbohotel/gameclients/GameClientManagerContractTest.java

@@ -0,0 +1,22 @@
+package com.eu.habbo.habbohotel.gameclients;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
+
+class GameClientManagerContractTest {
+
+    @Test
+    void exposesExplicitForcedDisposePath() {
+        assertDoesNotThrow(() -> GameClient.class.getDeclaredMethod("dispose", boolean.class));
+        assertDoesNotThrow(() -> GameClientManager.class.getDeclaredMethod("forceDisposeClient", GameClient.class));
+    }
+
+    @Test
+    void disposeMethodsIgnoreNullClient() {
+        GameClientManager manager = new GameClientManager();
+
+        assertDoesNotThrow(() -> manager.disposeClient(null));
+        assertDoesNotThrow(() -> manager.forceDisposeClient(null));
+    }
+}