Scaffold Minecraft game stubs

Add empty per-component subdirectories under src/{Analyser,Log,Parser,Pattern}/Minecraft/
with .gitkeep markers, plus MinecraftDetective stub extending the base Detective with
a TODO body. Smoke test under test/tests/Games/Minecraft/ asserts the detective is
instantiable. Introduces src/Pattern/ as a new top-level component directory.

test/tests/Games/Minecraft/SmokeTest.php

@@ -0,0 +1,15 @@
+<?php
+
+namespace IndifferentKetchup\Codex\Test\Tests\Games\Minecraft;
+
+use IndifferentKetchup\Codex\Detective\Minecraft\MinecraftDetective;
+use PHPUnit\Framework\TestCase;
+
+class SmokeTest extends TestCase
+{
+    public function testDetectiveIsInstantiable(): void
+    {
+        $detective = new MinecraftDetective();
+        $this->assertInstanceOf(MinecraftDetective::class, $detective);
+    }
+}