feat: state, window and quiet rules

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BCrwHHnGCB5XH968Nxokqw

core/app/Scheduling/QuietRule.php

@@ -0,0 +1,36 @@
+<?php
+
+namespace App\Scheduling;
+
+use App\Enums\EventState;
+use App\Models\Event;
+use App\Models\User;
+use Carbon\CarbonImmutable;
+
+/** «Помню»: до какого момента молчать, по текущему состоянию. */
+final class QuietRule
+{
+    public function __construct(private readonly DueResolver $due) {}
+
+    public function afterAck(Event $event, User $user, EventState $state, Due $due, CarbonImmutable $now): CarbonImmutable
+    {
+        return match ($state) {
+            EventState::Preparing => $this->nextCascadePoint($event, $user, $due, $now),
+            EventState::Today => $now->startOfHour()->addHours(2),
+            EventState::Overdue => $now->startOfDay()->addDays(2),
+            default => $now,
+        };
+    }
+
+    private function nextCascadePoint(Event $event, User $user, Due $due, CarbonImmutable $now): CarbonImmutable
+    {
+        $today = $now->startOfDay();
+        foreach (Cascade::points($this->due->fireStart($event, $user), $due->day) as $point) {
+            if ($point->gt($today)) {
+                return $point;
+            }
+        }
+
+        return $this->due->todayStart($due, $user);
+    }
+}