Initial project scaffold

tasks/01_vector_add/cuda_skeleton.cu

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+// Workbook-local CUDA sketch for vector add.
+//
+// The repository-level implementation lives in kernels/cuda/src/vector_add.cu.
+// Read this side by side with the Triton version.
+
+// TODO(student):
+// 1. Compute global_idx from blockIdx.x, blockDim.x, and threadIdx.x.
+// 2. Guard the tail with if (global_idx < numel).
+// 3. Load x[global_idx] and y[global_idx].
+// 4. Store the sum.