revert: restore BeginCapture/EndCapture instead of TriggerCapture

TriggerCapture caused incomplete rdc files due to async file writing.
BeginCapture/EndCapture ensures synchronous file write on EndCapture.

tests/RHI/D3D12/integration/minimal/main.cpp

@@ -279,11 +279,34 @@ int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine
             ExecuteCommandList();
 
             if (frameCount >= targetFrameCount) {
-                RenderDocCapture::Get().TriggerCapture();
+                if (RenderDocCapture::Get().EndCapture()) {
-                Log("[INFO] RenderDoc capture triggered");
+                    Log("[INFO] RenderDoc capture ended");
+                }
+                WaitForGPU();
+                Log("[INFO] GPU idle, taking screenshot...");
+                bool screenshotResult = D3D12Screenshot::Capture(
+                    gDevice,
+                    gCommandQueue,
+                    gSwapChain.GetBackBuffer(gCurrentRTIndex),
+                    "minimal.ppm"
+                );
+                if (screenshotResult) {
+                    Log("[INFO] Screenshot saved to minimal.ppm");
+                } else {
+                    Log("[ERROR] Screenshot failed");
+                }
+                Log("[INFO] RenderDoc capture completed");
+                break;
             }
 
-            // Present
+            if (frameCount == targetFrameCount - 1) {
+                if (RenderDocCapture::Get().BeginCapture("D3D12_Minimal_Test")) {
+                    Log("[INFO] RenderDoc capture started");
+                }
+            }
+
+            EndRender();
+            ExecuteCommandList();
             gSwapChain.Present(0, 0);
 
             if (frameCount >= targetFrameCount) {

tests/RHI/D3D12/integration/quad/main.cpp

@@ -400,6 +400,9 @@ int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine
             frameCount++;
 
             if (frameCount >= targetFrameCount) {
+                if (RenderDocCapture::Get().EndCapture()) {
+                    Log("[INFO] RenderDoc capture ended");
+                }
                 Log("[INFO] Reached target frame count %d - taking screenshot!", targetFrameCount);
                 WaitForGPU();
                 bool screenshotResult = D3D12Screenshot::Capture(
@@ -417,8 +420,9 @@ int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine
             }
 
             if (frameCount == targetFrameCount - 1) {
-                RenderDocCapture::Get().TriggerCapture();
+                if (RenderDocCapture::Get().BeginCapture("D3D12_Quad_Test")) {
-                Log("[INFO] RenderDoc capture triggered");
+                    Log("[INFO] RenderDoc capture started");
+                }
             }
 
             EndRender();

tests/RHI/D3D12/integration/sphere/main.cpp

@@ -492,6 +492,9 @@ int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine
             frameCount++;
 
             if (frameCount >= targetFrameCount) {
+                if (RenderDocCapture::Get().EndCapture()) {
+                    Log("[INFO] RenderDoc capture ended");
+                }
                 Log("[INFO] Reached target frame count %d - taking screenshot!", targetFrameCount);
                 WaitForGPU();
                 bool screenshotResult = D3D12Screenshot::Capture(
@@ -509,8 +512,9 @@ int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine
             }
 
             if (frameCount == targetFrameCount - 1) {
-                RenderDocCapture::Get().TriggerCapture();
+                if (RenderDocCapture::Get().BeginCapture("D3D12_Sphere_Test")) {
-                Log("[INFO] RenderDoc capture triggered");
+                    Log("[INFO] RenderDoc capture started");
+                }
             }
 
             EndRender();

tests/RHI/D3D12/integration/triangle/main.cpp

@@ -330,6 +330,9 @@ int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine
             frameCount++;
 
             if (frameCount >= targetFrameCount) {
+                if (RenderDocCapture::Get().EndCapture()) {
+                    Log("[INFO] RenderDoc capture ended");
+                }
                 Log("[INFO] Reached target frame count %d - taking screenshot!", targetFrameCount);
                 WaitForGPU();
                 Log("[INFO] GPU idle, taking screenshot...");
@@ -348,8 +351,9 @@ int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine
             }
 
             if (frameCount == targetFrameCount - 1) {
-                RenderDocCapture::Get().TriggerCapture();
+                if (RenderDocCapture::Get().BeginCapture("D3D12_Triangle_Test")) {
-                Log("[INFO] RenderDoc capture triggered");
+                    Log("[INFO] RenderDoc capture started");
+                }
             }
 
             EndRender();

tests/RHI/OpenGL/integration/minimal/main.cpp

@@ -131,14 +131,18 @@ int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine
             commandList.Clear(1.0f, 0.0f, 0.0f, 1.0f, 1 | 2);
 
             if (frameCount >= targetFrameCount - 1) {
-                RenderDocCapture::Get().TriggerCapture();
+                if (RenderDocCapture::Get().BeginCapture("OpenGL_Minimal_Test")) {
-                Log("[INFO] RenderDoc capture triggered");
+                    Log("[INFO] RenderDoc capture started");
+                }
             }
 
             swapChain.Present(0, 0);
             frameCount++;
 
             if (frameCount >= targetFrameCount) {
+                if (RenderDocCapture::Get().EndCapture()) {
+                    Log("[INFO] RenderDoc capture ended");
+                }
                 break;
             }
         }