test: remove redundant messageIdIsConsistent tests

The messageIdIsConsistent test was redundant because the existing
messageHasUid test already verifies that $message->id and
$message->getId() return the same instance.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: OskarStark

tests/Platform/Message/AssistantMessageTest.php

@@ -91,14 +91,4 @@ public function messageIdImplementsRequiredInterfaces(): void
         self::assertInstanceOf(TimeBasedUidInterface::class, $message->getId());
         self::assertInstanceOf(UuidV7::class, $message->getId());
     }
-
-    #[Test]
-    public function messageIdIsConsistent(): void
-    {
-        $message = new AssistantMessage('test');
-
-        // The same message instance should always return the same ID
-        self::assertSame($message->getId(), $message->getId());
-        self::assertSame($message->id, $message->getId());
-    }
 }

tests/Platform/Message/SystemMessageTest.php

@@ -71,14 +71,4 @@ public function messageIdImplementsRequiredInterfaces(): void
         self::assertInstanceOf(TimeBasedUidInterface::class, $message->getId());
         self::assertInstanceOf(UuidV7::class, $message->getId());
     }
-
-    #[Test]
-    public function messageIdIsConsistent(): void
-    {
-        $message = new SystemMessage('test');
-
-        // The same message instance should always return the same ID
-        self::assertSame($message->getId(), $message->getId());
-        self::assertSame($message->id, $message->getId());
-    }
 }

tests/Platform/Message/ToolCallMessageTest.php

@@ -78,15 +78,4 @@ public function messageIdImplementsRequiredInterfaces(): void
         self::assertInstanceOf(TimeBasedUidInterface::class, $message->getId());
         self::assertInstanceOf(UuidV7::class, $message->getId());
     }
-
-    #[Test]
-    public function messageIdIsConsistent(): void
-    {
-        $toolCall = new ToolCall('foo', 'bar');
-        $message = new ToolCallMessage($toolCall, 'test');
-
-        // The same message instance should always return the same ID
-        self::assertSame($message->getId(), $message->getId());
-        self::assertSame($message->id, $message->getId());
-    }
 }

tests/Platform/Message/UserMessageTest.php

@@ -121,14 +121,4 @@ public function messageIdImplementsRequiredInterfaces(): void
         self::assertInstanceOf(TimeBasedUidInterface::class, $message->getId());
         self::assertInstanceOf(UuidV7::class, $message->getId());
     }
-
-    #[Test]
-    public function messageIdIsConsistent(): void
-    {
-        $message = new UserMessage(new Text('test'));
-
-        // The same message instance should always return the same ID
-        self::assertSame($message->getId(), $message->getId());
-        self::assertSame($message->id, $message->getId());
-    }
 }