feat: web, webhook and telegram channel drivers

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

core/tests/Unit/Channels/WebChannelTest.php

@@ -0,0 +1,23 @@
+<?php
+
+namespace Tests\Unit\Channels;
+
+use App\Channels\WebChannel;
+use App\Enums\Presence;
+use App\Models\User;
+use Illuminate\Support\Facades\Cache;
+use Tests\TestCase;
+
+class WebChannelTest extends TestCase
+{
+    public function test_presence_follows_heartbeat(): void
+    {
+        $user = new User(['login' => 'n', 'tz' => 'UTC']);
+        $user->id = 7;
+        $driver = new WebChannel;
+
+        $this->assertSame(Presence::Absent, $driver->presence($user, []));
+        Cache::put('heartbeat:7', true, 90);
+        $this->assertSame(Presence::Present, $driver->presence($user, []));
+    }
+}