feat: source tokens and client events API

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

core/tests/Feature/SourceCreateCommandTest.php

@@ -0,0 +1,29 @@
+<?php
+
+namespace Tests\Feature;
+
+use App\Models\Source;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Tests\TestCase;
+
+class SourceCreateCommandTest extends TestCase
+{
+    use RefreshDatabase;
+
+    public function test_creates_source_and_prints_token_once(): void
+    {
+        $this->artisan('hado:source:create', ['name' => 'docs'])
+            ->expectsOutputToContain('Token: hado_')
+            ->assertSuccessful();
+
+        $source = Source::where('name', 'docs')->sole();
+        $this->assertSame(64, strlen($source->token_hash));
+    }
+
+    public function test_refuses_duplicate_name(): void
+    {
+        Source::create(['name' => 'docs', 'token_hash' => hash('sha256', 'x')]);
+
+        $this->artisan('hado:source:create', ['name' => 'docs'])->assertFailed();
+    }
+}