feat: TAA 时域抗锯齿（velocity + 邻域 clamp + 子像素抖动）

- Velocity buffer：Forward 第二颜色附件，vertex 计算 clip 空间运动向量
  （UBO 尾部追加 projNoJitter/prevView/prevProj；上一帧实例矩阵 SSBO
  Set0 binding2，与当前实例数组平行对齐——转动的物体速度正确不鬼影）
- 子像素抖动：SceneRenderer Halton(2,3)×8 序列，抖动只进光栅化投影
- TAA resolve pass：velocity 反推历史位置 + 3×3 邻域 clamp 去鬼影 +
  mix(cur,hist,0.9) 时域累积；TAAColor 自引用历史
- RG 历史读补 post-barrier：采样后恢复镜像 resting layout（TAA 的历史
  是 ColorAttachment layout，不恢复则下帧 entry oldLayout 脱节）
- 管线：Forward(HDR+Velocity) → TAA(TAAColor) → Bloom/Tonemap 改源 TAAColor
- 编译零错误、validation 零警告、8 秒冒烟通过（10 pass 全活跃）

Engine/src/Renderer/Passes/TAAPass.cpp

@@ -0,0 +1,51 @@
+//
+// Created by atdunbg on 2026/9/23.
+//
+
+#include <Engine/Renderer/Passes/TAAPass.h>
+#include <Engine/Core/FrameContext.h>
+
+namespace Engine::Passes
+{
+    TAAPass::TAAPass(FullscreenGpu& gpu, f32 historyAlpha,
+                     RG::TextureHandle hdrColor, RG::TextureHandle velocity,
+                     RG::TextureHandle taaColor)
+        : m_Gpu(gpu), m_HistoryAlpha(historyAlpha),
+          m_HDR(hdrColor), m_Velocity(velocity), m_TAAColor(taaColor)
+    {
+        m_Sets.resize(kMaxFramesInFlight);
+        for (u32 slot = 0; slot < kMaxFramesInFlight; ++slot) {
+            m_Sets[slot] = m_Gpu.AllocateSet();
+        }
+    }
+
+    void TAAPass::Register(RG::RenderGraph& rg)
+    {
+        rg.AddPass("TAA",
+            [this](RG::RenderGraphContext& ctx) {
+                m_Gpu.RecordFullscreen(ctx, ctx.View(m_TAAColor), m_Gpu.taaFrag,
+                                       m_Sets[ctx.frame.frameSlot],
+                                       FullscreenPush{0.0f, m_HistoryAlpha, 0.0f, 0.0f});
+            })
+            .Read(m_HDR, RG::ResourceUse::ShaderRead,
+                  vk::ShaderStageFlagBits::eFragment)
+            .Read(m_Velocity, RG::ResourceUse::ShaderRead,
+                  vk::ShaderStageFlagBits::eFragment)
+            // 自引用历史：TAAColor 的上一帧槽位就是累积历史
+            .ReadHistory(m_TAAColor, RG::ResourceUse::ShaderRead,
+                         vk::ShaderStageFlagBits::eFragment)
+            .Write(m_TAAColor, RG::ResourceUse::ColorAttachment);
+    }
+
+    void TAAPass::OnTargetsRebuilt(RG::RenderGraph& rg)
+    {
+        for (u32 slot = 0; slot < kMaxFramesInFlight; ++slot) {
+            m_Gpu.UpdateSetInput(m_Sets[slot], 0, rg, m_HDR, slot);
+            m_Gpu.UpdateSetInput(m_Sets[slot], 1, rg, m_Velocity, slot);
+            // binding2 = 历史（上一帧槽位镜像）
+            m_Gpu.UpdateSetInput(m_Sets[slot], 2, rg, m_TAAColor,
+                                 rg.HistorySlot(slot));
+        }
+    }
+
+} // namespace Engine::Passes