refactor(wpmc S7): tighten tests + cleanup bootstrap shims

- PluginBootS7Test idempotency: assertTrue(class_exists) instead of assertTrue(true)
- ZipArchiveBuildTest: try/finally cleanup + unzip exit-code check
- bootstrap.php: drop unused PUC shims (wp_remote_post, transient*)
- CHANGELOG.md: header references Keep a Changelog (was: mirrors readme.txt)

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

CHANGELOG.md

@@ -1,6 +1,6 @@
 # Changelog
 
-All notable changes to wp-multi-city. Format mirrors `readme.txt`.
+All notable changes to wp-multi-city. Format follows [Keep a Changelog](https://keepachangelog.com/).
 
 ## [1.0.0] — 2026-05-17
 

tests/PluginBootS7Test.php

@@ -41,6 +41,9 @@ final class PluginBootS7Test extends TestCase
         Plugin::instance()->boot();
         Plugin::instance()->boot();
 
-        self::assertTrue(true, 'Double boot must not throw');
+        self::assertTrue(
+            class_exists('YahnisElsts\\PluginUpdateChecker\\v5\\PucFactory'),
+            'PucFactory must still be loaded after double boot()'
+        );
     }
 }

tests/ZipArchiveBuildTest.php

@@ -25,7 +25,11 @@ final class ZipArchiveBuildTest extends BaseTestCase
         exec($cmd, $out, $rc);
         self::assertSame(0, $rc, 'git archive failed: ' . implode("\n", $out));
 
-        exec('unzip -l ' . escapeshellarg($zipPath), $listing);
+        try {
+            $listing = [];
+            $unzipRc = 0;
+            exec('unzip -l ' . escapeshellarg($zipPath), $listing, $unzipRc);
+            self::assertSame(0, $unzipRc, 'unzip -l failed (is unzip installed?)');
             $joined = implode("\n", $listing);
 
             $required = [
@@ -57,9 +61,12 @@ final class ZipArchiveBuildTest extends BaseTestCase
                     "dev file leaked into archive: {$path}"
                 );
             }
-
+        } finally {
+            if (file_exists($zipPath)) {
                 unlink($zipPath);
             }
+        }
+    }
 
     public function test_wp_plugin_info_json_is_valid(): void
     {

tests/bootstrap.php

@@ -68,21 +68,6 @@ if (!function_exists('update_option')) {
         return true;
     }
 }
-if (!function_exists('set_transient')) {
-    function set_transient(string $key, $value, int $expiry = 0): bool {
-        return true;
-    }
-}
-if (!function_exists('get_transient')) {
-    function get_transient(string $key) {
-        return false;
-    }
-}
-if (!function_exists('delete_transient')) {
-    function delete_transient(string $key): bool {
-        return true;
-    }
-}
 if (!function_exists('wp_next_scheduled')) {
     function wp_next_scheduled(string $hook, array $args = []) {
         return false;
@@ -114,12 +99,6 @@ if (!function_exists('wp_remote_get')) {
         return false;
     }
 }
-if (!function_exists('wp_remote_post')) {
-    function wp_remote_post(string $url, array $args = []) {
-        return false;
-    }
-}
-
 require_once __DIR__ . '/../includes/class-plugin.php';
 \WPMultiCity\Plugin::register_autoloader();