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/test_dungeon_objects.h

@@ -0,0 +1,46 @@
+#ifndef YAZE_TEST_TEST_DUNGEON_OBJECTS_H
+#define YAZE_TEST_TEST_DUNGEON_OBJECTS_H
+
+#include <memory>
+#include <vector>
+
+#include "app/rom.h"
+#include "gtest/gtest.h"
+#include "mocks/mock_rom.h"
+#include "testing.h"
+
+namespace yaze {
+namespace test {
+
+/**
+ * @brief Simplified test framework for dungeon object rendering
+ * 
+ * This provides a clean, focused testing environment for dungeon object
+ * functionality without the complexity of full integration tests.
+ */
+class TestDungeonObjects : public ::testing::Test {
+ protected:
+  void SetUp() override;
+  void TearDown() override;
+
+  // Test helpers
+  absl::Status CreateTestRom();
+  absl::Status SetupObjectData();
+  
+  // Mock data generators
+  std::vector<uint8_t> CreateObjectSubtypeTable(int base_addr, int count);
+  std::vector<uint8_t> CreateTileData(int base_addr, int tile_count);
+  std::vector<uint8_t> CreateRoomHeader(int room_id);
+
+  std::unique_ptr<MockRom> test_rom_;
+  
+  // Test constants
+  static constexpr int kTestObjectId = 0x01;
+  static constexpr int kTestRoomId = 0x00;
+  static constexpr size_t kTestRomSize = 0x100000; // 1MB test ROM
+};
+
+}  // namespace test
+}  // namespace yaze
+
+#endif  // YAZE_TEST_TEST_DUNGEON_OBJECTS_H