Initial baseline: LaraBlog core with plugin commerce surface.

Captures the current working tree after theme slots, ArticleAccess, and the payment / paid-content plugins so subsequent work has a reviewable git history.

tests/Unit/ContentRendererTest.php

@@ -0,0 +1,37 @@
+<?php
+
+namespace Tests\Unit;
+
+use App\Domain\Blog\ContentFormat;
+use App\Domain\Blog\ContentRenderer;
+use Tests\TestCase;
+
+class ContentRendererTest extends TestCase
+{
+    public function test_markdown_renders_to_html(): void
+    {
+        $html = app(ContentRenderer::class)->toHtml("# Hello\n\n**world**", ContentFormat::MARKDOWN);
+
+        $this->assertMatchesRegularExpression('/<h1[^>]*>Hello<\/h1>/', $html);
+        $this->assertStringContainsString('<strong>world</strong>', $html);
+    }
+
+    public function test_html_format_passes_through_purifier(): void
+    {
+        $html = app(ContentRenderer::class)->toHtml(
+            '<p>ok</p><script>alert(1)</script>',
+            ContentFormat::HTML,
+        );
+
+        $this->assertStringContainsString('<p>ok</p>', $html);
+        $this->assertStringNotContainsString('<script>', $html);
+    }
+
+    public function test_html_to_markdown_roundtrip_basic(): void
+    {
+        $md = app(ContentRenderer::class)->htmlToMarkdown('<h2>Title</h2><p>Hello <strong>x</strong></p>');
+
+        $this->assertStringContainsString('Title', $md);
+        $this->assertStringContainsString('Hello', $md);
+    }
+}