[Example] add example of vector addition

[WilliamZhang20]

Summary

Add a minimal vector add example that shows how to implement elementwise c[i] = a[i] + b[i] in Tilus. Each thread block loads a contiguous tile from a and b, adds in registers, and stores c, in a single kernel launch (simple global load/add/store pattern).

Kernel uses a fixed tile size (1024 elements per block) and 4 warps per block (no autotune).

Benchmark results (NVIDIA H200 NVL 143 GB)

n	torch (ms)	tilus (ms)	speedup
1048576	0.015	0.016	0.94x
16777216	0.091	0.090	1.02x

Test Plan

• pytest tests/examples/test_examples.py -v -k "vector_add" passes
• test_all_examples_are_listed passes (vector_add registered in EXAMPLES)
• test_no_missing_examples passes

Signed-off-by: William Zhang wzhang20@yahoo.com

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[yaoyaoding]

/ok to test 4281491

[yaoyaoding]

Hi @WilliamZhang20 , could you run pre-commit run --all to lint the changes, thank you!

[yaoyaoding]

/ok to test c1d50d0