fix: honest installer success message

Gate the installer success/license/next-steps message behind a fail-open
verifier so the installer never reports success when the install failed or
only partially completed.

- Package scripts: verify every child extension declared in the manifest
  actually registered in #__extensions before showing the license message.
- com_mokoog component script: verify the declared SQL tables exist before
  echoing the success message.

Mirrors MokoSuiteHQ PR #72 and MokoSuiteClient PR #300. Both checks are wrapped
in try/catch and fail open, so a transient DB/IO glitch never fakes a failure.

Claude-Session: https://claude.ai/code/session_01B9aZHSWbiiZykJD88pYx8R

source/packages/com_mokoog/script.php

@@ -10,7 +10,9 @@
 
 defined('_JEXEC') or die;
 
+use Joomla\CMS\Factory;
 use Joomla\CMS\Installer\InstallerAdapter;
+use Joomla\Database\DatabaseInterface;
 
 class Com_MokoOGInstallerScript
 {
@@ -23,6 +25,20 @@ class Com_MokoOGInstallerScript
      */
     public function install(InstallerAdapter $parent): void
     {
+        // Be honest about success: don't claim a clean install if the component's
+        // own tables never landed. Fails open (see missingTables) so a query/IO
+        // glitch never fakes a failure.
+        $missing = $this->missingTables();
+
+        if (!empty($missing))
+        {
+            echo '<p>MokoSuiteOpenGraph component did not install correctly. '
+                . 'Missing database table(s): '
+                . htmlspecialchars(implode(', ', $missing), ENT_QUOTES) . '.</p>';
+
+            return;
+        }
+
         echo '<p>MokoSuiteOpenGraph component installed successfully.</p>';
     }
 
@@ -35,6 +51,69 @@ class Com_MokoOGInstallerScript
      */
     public function update(InstallerAdapter $parent): void
     {
+        $missing = $this->missingTables();
+
+        if (!empty($missing))
+        {
+            echo '<p>MokoSuiteOpenGraph component did not update correctly. '
+                . 'Missing database table(s): '
+                . htmlspecialchars(implode(', ', $missing), ENT_QUOTES) . '.</p>';
+
+            return;
+        }
+
         echo '<p>MokoSuiteOpenGraph component updated successfully.</p>';
     }
+
+    /**
+     * Verify the component's declared tables actually exist. Reads the shipped
+     * install SQL, extracts every CREATE TABLE #__name, resolves the live prefix,
+     * and checks each against the database's table list (case-insensitive).
+     *
+     * FAILS OPEN: any error (unreadable SQL, query failure) returns [] so a
+     * transient glitch never turns a good install into a false failure.
+     *
+     * @return  string[]  Prefixed names of any missing tables.
+     */
+    private function missingTables(): array
+    {
+        try
+        {
+            $sqlFile = JPATH_ADMINISTRATOR . '/components/com_mokoog/sql/install.mysql.sql';
+
+            if (!is_file($sqlFile))
+            {
+                return [];
+            }
+
+            $sql = (string) file_get_contents($sqlFile);
+
+            if ($sql === '' || !preg_match_all('/CREATE\s+TABLE\s+(?:IF\s+NOT\s+EXISTS\s+)?[`"\']?(#__[A-Za-z0-9_]+)/i', $sql, $m))
+            {
+                return [];
+            }
+
+            $db       = Factory::getContainer()->get(DatabaseInterface::class);
+            $prefix   = $db->getPrefix();
+            $existing = array_map('strtolower', (array) $db->getTableList());
+            $missing  = [];
+
+            foreach (array_unique($m[1]) as $table)
+            {
+                $real = str_replace('#__', $prefix, $table);
+
+                if (!in_array(strtolower($real), $existing, true))
+                {
+                    $missing[] = $real;
+                }
+            }
+
+            return $missing;
+        }
+        catch (\Throwable $e)
+        {
+            // Fail open — never fake a failure on a glitch.
+            return [];
+        }
+    }
 }