docs: update TEST_SPEC.md and README.md to reflect new directory structure

- TEST_SPEC.md: Updated test directory structure to reflect Core/Asset,
  Core/IO, and Resources/<Type> subdirectories
- TEST_SPEC.md: Updated module names and test counts (852 total)
- TEST_SPEC.md: Updated build commands for new Resources subdirectories
- README.md: Updated engine structure with Core/Asset/ and Core/IO/
- README.md: Updated Resources section with layered architecture
- README.md: Updated test coverage table with accurate counts

engine/src/Resources/AudioClip/AudioClip.cpp

@@ -1,4 +1,4 @@
-#include "Resources/AudioClip.h"
+#include <XCEngine/Resources/AudioClip/AudioClip.h>
 
 namespace XCEngine {
 namespace Resources {

engine/src/Resources/AudioClip/AudioLoader.cpp

@@ -1,6 +1,6 @@
-#include "Resources/AudioLoader.h"
-#include "Resources/ResourceManager.h"
-#include "Resources/ResourceTypes.h"
+#include <XCEngine/Resources/AudioClip/AudioLoader.h>
+#include <XCEngine/Core/Asset/ResourceManager.h>
+#include <XCEngine/Core/Asset/ResourceTypes.h>
 #include <cstring>
 
 namespace XCEngine {

engine/src/Resources/Material/Material.cpp

@@ -1,5 +1,6 @@
-#include "Resources/Material.h"
-#include "Resources/Shader.h"
+#include <XCEngine/Resources/Material/Material.h>
+#include <XCEngine/Resources/Shader/Shader.h>
+#include <XCEngine/Core/Asset/ResourceManager.h>
 
 namespace XCEngine {
 namespace Resources {

engine/src/Resources/Material/MaterialLoader.cpp

@@ -1,6 +1,6 @@
-#include "Resources/MaterialLoader.h"
-#include "Resources/ResourceManager.h"
-#include "Resources/ResourceTypes.h"
+#include <XCEngine/Resources/Material/MaterialLoader.h>
+#include <XCEngine/Core/Asset/ResourceManager.h>
+#include <XCEngine/Core/Asset/ResourceTypes.h>
 
 namespace XCEngine {
 namespace Resources {

engine/src/Resources/Mesh/Mesh.cpp

@@ -1,4 +1,4 @@
-#include "Resources/Mesh.h"
+#include <XCEngine/Resources/Mesh/Mesh.h>
 #include <cstring>
 
 namespace XCEngine {

engine/src/Resources/Mesh/MeshImportSettings.cpp

@@ -1,4 +1,4 @@
-#include <XCEngine/Resources/MeshImportSettings.h>
+#include <XCEngine/Resources/Mesh/MeshImportSettings.h>
 
 namespace XCEngine {
 namespace Resources {

engine/src/Resources/Mesh/MeshLoader.cpp

@@ -1,5 +1,5 @@
-#include "Resources/MeshLoader.h"
-#include "Resources/ResourceManager.h"
+#include <XCEngine/Resources/Mesh/MeshLoader.h>
+#include <XCEngine/Core/Asset/ResourceManager.h>
 
 namespace XCEngine {
 namespace Resources {

engine/src/Resources/Shader/Shader.cpp

@@ -1,4 +1,4 @@
-#include "Resources/Shader.h"
+#include <XCEngine/Resources/Shader/Shader.h>
 
 namespace XCEngine {
 namespace Resources {

engine/src/Resources/Shader/ShaderLoader.cpp

@@ -1,6 +1,6 @@
-#include "Resources/ShaderLoader.h"
-#include "Resources/ResourceManager.h"
-#include "Resources/ResourceTypes.h"
+#include <XCEngine/Resources/Shader/ShaderLoader.h>
+#include <XCEngine/Core/Asset/ResourceManager.h>
+#include <XCEngine/Core/Asset/ResourceTypes.h>
 
 namespace XCEngine {
 namespace Resources {

engine/src/Resources/Texture/Texture.cpp

@@ -1,4 +1,4 @@
-#include "Resources/Texture.h"
+#include <XCEngine/Resources/Texture/Texture.h>
 #include <cstring>
 
 namespace XCEngine {

engine/src/Resources/Texture/TextureImportSettings.cpp

@@ -1,4 +1,4 @@
-#include <XCEngine/Resources/TextureImportSettings.h>
+#include <XCEngine/Resources/Texture/TextureImportSettings.h>
 
 namespace XCEngine {
 namespace Resources {

engine/src/Resources/Texture/TextureLoader.cpp

@@ -1,5 +1,5 @@
-#include "Resources/TextureLoader.h"
-#include "Resources/ResourceManager.h"
+#include <XCEngine/Resources/Texture/TextureLoader.h>
+#include <XCEngine/Core/Asset/ResourceManager.h>
 
 namespace XCEngine {
 namespace Resources {