chore: snapshot editor work and restore tests

Key points:\n- restore the tests tree removed by bc47e6e\n- capture current editor workspace, scene, and docs reshuffle changes\n- keep local cloud.nvdb resources ignored from this commit

tests/memory/test_memory_manager.cpp

@@ -0,0 +1,44 @@
+#include <gtest/gtest.h>
+#include <XCEngine/Memory/MemoryManager.h>
+
+using namespace XCEngine::Memory;
+
+namespace {
+
+class MemoryTest : public ::testing::Test {
+protected:
+    void SetUp() override {
+        MemoryManager::Get().Initialize();
+    }
+    
+    void TearDown() override {
+        MemoryManager::Get().Shutdown();
+    }
+};
+
+TEST_F(MemoryTest, GetSystemAllocator_ReturnsValidPointer) {
+    IAllocator* allocator = MemoryManager::Get().GetSystemAllocator();
+    ASSERT_NE(allocator, nullptr);
+}
+
+TEST_F(MemoryTest, CreateLinearAllocator) {
+    auto allocator = MemoryManager::Get().CreateLinearAllocator(1024);
+    ASSERT_NE(allocator, nullptr);
+    EXPECT_EQ(allocator->GetCapacity(), 1024u);
+}
+
+TEST_F(MemoryTest, CreatePoolAllocator) {
+    auto allocator = MemoryManager::Get().CreatePoolAllocator(64, 100);
+    ASSERT_NE(allocator, nullptr);
+    EXPECT_EQ(allocator->GetBlockSize(), 64u);
+    EXPECT_EQ(allocator->GetTotalBlockCount(), 100u);
+    EXPECT_EQ(allocator->GetFreeBlockCount(), 100u);
+}
+
+TEST_F(MemoryTest, CreateProxyAllocator) {
+    auto allocator = MemoryManager::Get().CreateProxyAllocator("Test");
+    ASSERT_NE(allocator, nullptr);
+    EXPECT_STREQ(allocator->GetName(), "Test");
+}
+
+} // namespace