Add E2E and ZSCustomOverworld test suites for comprehensive testing

- Introduced new E2E test suite for comprehensive ROM testing, validating the complete ROM editing workflow.
- Added ZSCustomOverworld test suite to validate version upgrades and data integrity.
- Updated `EditorManager` to register the new test suites.
- Enhanced CMake configuration to include the new test files.
- Updated README to reflect the new testing capabilities and best practices for AI agent testing.

test/unit/zelda3/dungeon_room_test.cc

@@ -0,0 +1,34 @@
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+
+#include "app/rom.h"
+#include "app/zelda3/dungeon/room.h"
+
+namespace yaze {
+namespace test {
+
+class DungeonRoomTest : public ::testing::Test {
+ protected:
+  void SetUp() override {
+    // Skip tests on Linux for automated github builds
+#if defined(__linux__)
+    GTEST_SKIP();
+#else
+    if (!rom_.LoadFromFile("./zelda3.sfc").ok()) {
+      GTEST_SKIP_("Failed to load test ROM");
+    }
+#endif
+  }
+  void TearDown() override {}
+
+  Rom rom_;
+};
+
+TEST_F(DungeonRoomTest, SingleRoomLoadOk) {
+  zelda3::Room test_room(/*room_id=*/0, &rom_);
+
+  test_room = zelda3::LoadRoomFromRom(&rom_, /*room_id=*/0);
+}
+
+}  // namespace test
+}  // namespace yaze