Normalize stderr in callback watch test

Make the callback watch feature test compare stderr semantically by collapsing whitespace before assertions. This avoids brittle failures from formatting differences while keeping the redaction and replay guidance checks intact.

Author: tehwave

tests/Feature/Commands/Callbacks/WatchCallbacksCommandTest.php

@@ -313,18 +313,19 @@ public function run(
         '--to' => 'http://localhost/callback',
     ], ['capture_stderr_separately' => true]);
     $errorOutput = $tester->getErrorOutput();
+    $semanticErrorOutput = preg_replace('/\s+/', ' ', $errorOutput) ?? $errorOutput;
 
     expect($result)->toBe(1)
         ->and($tester->getDisplay())->not->toContain('Callback delivery failed')
-        ->and($errorOutput)
+        ->and($semanticErrorOutput)
         ->toContain('Callback delivery failed for payment 42 operation [redacted]-operation')
         ->toContain($context)
         ->toContain('callbacks:replay 42')
         ->toContain('--to=<corrected-url>')
         ->not->toContain('watch-api-key');
 
     if ($unexpectedContext !== null) {
-        expect($errorOutput)->not->toContain($unexpectedContext);
+        expect($semanticErrorOutput)->not->toContain($unexpectedContext);
     }
 
     Http::assertNothingSent();