Initial project scaffold

tasks/03_tiled_matmul/cuda_skeleton.cu

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+// Workbook-local CUDA sketch for tiled matmul.
+//
+// TODO(student):
+// 1. Choose a block tile size, for example 16x16 or 32x32.
+// 2. Load one A tile and one B tile into shared memory.
+// 3. Synchronize.
+// 4. Accumulate partial products.
+// 5. Synchronize before loading the next tile.
+// 6. Store the final C element or tile.