(fix): getConnection routes but doesn't send — remove drain, send directly

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: abnegate

tests/Integration/TCPServerTest.php

@@ -61,19 +61,17 @@ public function testTCPAdapterGetConnectionAndClose(): void
                 $adapter->setTimeout(5.0);
                 $adapter->setConnectTimeout(2.0);
 
-                // getConnection dials the backend and caches by fd
-                $client = $adapter->getConnection('hello', 1);
+                // getConnection dials the backend and caches by fd.
+                // The $data arg is routing input (passed to route()),
+                // not sent to the backend — the server does that.
+                $client = $adapter->getConnection('routing-data', 1);
                 $this->assertInstanceOf(Client::class, $client);
                 $this->assertTrue($client->isConnected());
 
                 // Same fd returns cached connection
                 $cached = $adapter->getConnection('ignored', 1);
                 $this->assertSame($client, $cached);
 
-                // Drain the echo from the initial 'hello' handshake
-                $echo = $client->recv(1.0);
-                $this->assertSame('hello', $echo);
-
                 // Send/recv through the established connection
                 $client->send('ping');
                 $response = $client->recv(1.0);