fix: add final modifier to 6 velocity test classes; fix TESTING.md example method name

All test classes must be final per plan conventions.
Fix example method name in TESTING.md to reference an actual test method.

Author: objz

TESTING.md

@@ -18,7 +18,7 @@ the test suite covers the core scripting engine, security, networking primitives
 ./gradlew :core:test --tests "dev.objz.commandbridge.security.AuthServiceTest"
 
 # run a single test method
-./gradlew :core:test --tests "dev.objz.commandbridge.security.AuthServiceTest.rejectsExpiredToken"
+./gradlew :core:test --tests "dev.objz.commandbridge.security.AuthServiceTest.signValidInputReturnsDeterministicOutput"
 
 # run checkstyle + all tests (what CI runs)
 ./gradlew check

velocity/src/test/java/dev/objz/commandbridge/velocity/dispatch/CommandDispatcherTest.java

@@ -23,7 +23,7 @@
  * method via reflection, verifying permission set construction from script names and
  * command strings.
  */
-class CommandDispatcherTest {
+final class CommandDispatcherTest {
 
     private static CommandDispatcher dispatcher;
     private static Method buildOPPermissions;

velocity/src/test/java/dev/objz/commandbridge/velocity/dispatch/stage/ArgumentMappingStageTest.java

@@ -29,7 +29,7 @@
  * Tests for {@link ArgumentMappingStage} — verifies argument mapping from invoked
  * arguments to script-defined argument definitions.
  */
-class ArgumentMappingStageTest {
+final class ArgumentMappingStageTest {
 
     @BeforeAll
     static void setUp() {

velocity/src/test/java/dev/objz/commandbridge/velocity/dispatch/stage/PermissionCheckStageTest.java

@@ -27,7 +27,7 @@
  * Tests for {@link PermissionCheckStage} — verifies permission gating, disabled
  * permissions bypass, and silent mode behavior.
  */
-class PermissionCheckStageTest {
+final class PermissionCheckStageTest {
 
     private static final String SCRIPT_NAME = "lobby";
     private static final String PERM_NODE = "commandbridge.command." + SCRIPT_NAME;

velocity/src/test/java/dev/objz/commandbridge/velocity/dispatch/stage/ScriptResolutionStageTest.java

@@ -29,7 +29,7 @@
  * Tests for {@link ScriptResolutionStage} — verifies script lookup by exact name,
  * alias, and case-insensitive matching.
  */
-class ScriptResolutionStageTest {
+final class ScriptResolutionStageTest {
 
     @BeforeAll
     static void setUp() {

velocity/src/test/java/dev/objz/commandbridge/velocity/util/CooldownManagerTest.java

@@ -13,7 +13,7 @@
  * Tests for {@link CooldownManager} — verifies cooldown setting, checking,
  * remaining duration, zero-duration handling, and per-player/per-script isolation.
  */
-class CooldownManagerTest {
+final class CooldownManagerTest {
 
     private CooldownManager manager;
 

velocity/src/test/java/dev/objz/commandbridge/velocity/util/PlayerTrackerTest.java

@@ -19,7 +19,7 @@
  * Tests for {@link PlayerTracker} — verifies player add/remove, update with join
  * listener firing, unknown player/client lookups, and listener exception isolation.
  */
-class PlayerTrackerTest {
+final class PlayerTrackerTest {
 
     private PlayerTracker tracker;