feat: enums, schema and models for hado core

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

core/app/Models/Delivery.php

@@ -0,0 +1,34 @@
+<?php
+
+namespace App\Models;
+
+use App\Enums\DeliveryResult;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+class Delivery extends Model
+{
+    protected $guarded = [];
+
+    protected $attributes = ['meta' => '{}'];
+
+    protected function casts(): array
+    {
+        return [
+            'result' => DeliveryResult::class,
+            'window_start' => 'immutable_datetime',
+            'sent_at' => 'immutable_datetime',
+            'meta' => 'array',
+        ];
+    }
+
+    public function event(): BelongsTo
+    {
+        return $this->belongsTo(Event::class);
+    }
+
+    public function channel(): BelongsTo
+    {
+        return $this->belongsTo(Channel::class);
+    }
+}