feat(activator): seed silent-drop options (dry-run on by default) on activate

includes/class-activator.php

@@ -12,6 +12,7 @@ final class Activator
     {
         self::guard_requirements();
         self::install_table();
+        self::seed_silent_drop_options();
         self::schedule_events();
     }
 
@@ -64,6 +65,27 @@ final class Activator
         update_option(self::DB_VERSION_OPTION, self::DB_VERSION);
     }
 
+    /**
+     * Seed safe defaults for silent-drop options. Uses add_option (not update_option),
+     * so existing values from prior versions or user customisations are preserved.
+     * Runs on every activate() call — fresh installs and upgrades alike.
+     */
+    private static function seed_silent_drop_options(): void
+    {
+        add_option(Settings::OPT_DRY_RUN_DROP, true);
+        add_option(Settings::OPT_DROP_THRESHOLD, -5);
+        add_option(Settings::OPT_HARD_DROP_ENABLED, true);
+        add_option(Settings::OPT_DROP_COUNTERS, [
+            'total'          => 0,
+            'real_today'     => 0,
+            'real_yesterday' => 0,
+            'dry_today'      => 0,
+            'dry_yesterday'  => 0,
+            'today_date'     => wp_date('Y-m-d'),
+            'reset_at'       => wp_date('Y-m-d'),
+        ]);
+    }
+
     private static function schedule_events(): void
     {
         // Register the custom 60-second schedule here — Dispatcher::register_hooks()