fix(config): enable explicit face focus

tests/check-host-config-patch.php

@@ -0,0 +1,39 @@
+<?php
+/** Регрессия правила: deploy меняет только явно согласованный ключ focus. */
+
+declare(strict_types=1);
+
+$root = dirname(__DIR__);
+$script = $root . '/bin/ensure-focus-config.php';
+$fixture = [
+    'host' => 'custom.example',
+    'requisites' => ['Не менять'],
+    'utm' => [
+        'theme' => ['weights' => ['dark' => 7, 'light' => 3], 'default' => 'light'],
+        'focus' => ['weights' => ['center' => 9, 'face' => 1], 'default' => 'center'],
+    ],
+];
+$path = tempnam(sys_get_temp_dir(), 'preland-config-');
+if ($path === false) {
+    fwrite(STDERR, "FAIL: не создан временный config.\n");
+    exit(1);
+}
+
+try {
+    file_put_contents($path, json_encode($fixture, JSON_THROW_ON_ERROR));
+    exec(PHP_BINARY . ' ' . escapeshellarg($script) . ' ' . escapeshellarg($path), $output, $code);
+    $actual = json_decode((string) file_get_contents($path), true, 512, JSON_THROW_ON_ERROR);
+} finally {
+    @unlink($path);
+}
+
+if ($code !== 10
+    || ($actual['host'] ?? null) !== 'custom.example'
+    || ($actual['requisites'] ?? null) !== ['Не менять']
+    || ($actual['utm']['theme'] ?? null) !== $fixture['utm']['theme']
+    || ($actual['utm']['focus'] ?? null) !== ['weights' => ['center' => 0, 'face' => 1], 'default' => 'face']) {
+    fwrite(STDERR, "FAIL: host-config должен сохранить все значения, кроме явно заданного focus.\n");
+    exit(1);
+}
+
+fwrite(STDOUT, "OK: host config changes only explicit focus\n");