feat(control): connect physical feedback to bounded V4 command and fallback paths

tests/NetzfahrplanV4RueckmeldungTest.php

@@ -0,0 +1,25 @@
+<?php
+
+declare(strict_types=1);
+namespace Belevo\EnelixEMS\Tests;
+
+use PHPUnit\Framework\TestCase;
+
+final class NetzfahrplanV4RueckmeldungTest extends TestCase
+{
+    private function checkScript(string $name): void
+    {
+        $pipes=[];
+        $p=proc_open([PHP_BINARY,__DIR__.'/V4Feedback/'.$name],
+            [0=>['pipe','r'],1=>['pipe','w'],2=>['pipe','w']],$pipes);
+        self::assertIsResource($p);fclose($pipes[0]);
+        $out=stream_get_contents($pipes[1]);$err=stream_get_contents($pipes[2]);
+        fclose($pipes[1]);fclose($pipes[2]);
+        self::assertSame(0,proc_close($p),$out.$err);
+        self::assertSame('',$err);self::assertStringContainsString('TOTAL ',$out);
+    }
+    public function testPhysicalFeedback(): void {$this->checkScript('checks.php');}
+    public function testActualReceiverIntegration(): void {$this->checkScript('receiver_checks.php');}
+    public function testActualFallbackWrapper(): void {$this->checkScript('fallback_checks.php');}
+    public function testMessageWithoutVisibleDiagnostics(): void {$this->checkScript('message_checks.php');}
+}