D3D11: Note that the state object caches are deliberately never trimmed

Co-Authored-By: Claude Opus 5.5 (1M context) <[email protected]>

GPU/D3D11/DrawEngineD3D11.h

@@ -110,6 +110,9 @@ private:
 	PushBufferD3D11 *pushInds_ = nullptr;
 
 	// D3D11 state object caches. Previously had smart pointers but they were harder to deal with.
+	// These are never trimmed, although D3D11 allows only 4096 unique state objects per type and a
+	// failed create is fatal. That's deliberate: games use far fewer combinations, so it isn't an
+	// issue in practice, and eviction would cost more than it's worth.
 	DenseHashMap<uint64_t, ID3D11BlendState *> blendCache_;
 	DenseHashMap<uint64_t, ID3D11BlendState1 *> blendCache1_;
 	DenseHashMap<uint64_t, ID3D11DepthStencilState *> depthStencilCache_;