feat(scala): m01–m06 port with shared fixtures

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

scala/test/M06View.test.scala

@@ -0,0 +1,12 @@
+package snake
+
+import Fixtures.*
+
+class M06ViewSuite extends munit.FunSuite:
+  test("CELL is 20 pixels") { assertEquals(View.CELL, 20) }
+
+  cases("m06-view").foreach { c =>
+    test(s"view: ${c("name").str}") {
+      assertEquals(View.view(gameState(c("args")(0))), list(c("expected"))(shape))
+    }
+  }