fix(ks/auto-bench): clone reference inputs for v1 instead of re-seeding

[Jiwangreal]

Summary

v0/reference get_inputs is now the canonical input source. v1 receives a deep copy of the same tensors via clone_value() instead of generating its own inputs under the same seed, eliminating false correctness failures from CPU vs CUDA RNG differences.

compare_case later moves both copies to the same accelerator before executing either implementation, so device placement is unaffected.

Changes

• benchmarks/ks/auto_bench.py: In build_case, v1 inputs are cloned from v0 canonical inputs instead of independently generated via set_seed + v1_get_inputs. Removes the argument-count check (canonical data guarantees matching lengths).
• tests/benchmarks/test_ks_auto_bench.py: Adds test_build_case_clones_reference_inputs_for_v1 verifying both value equality and independent storage (distinct data_ptr).

Verification

• python3.10 -m unittest tests.benchmarks.test_ks_auto_bench -v passed 4/4
• Task 1 benchmark passes accuracy check at 1.069x speedup

Closes the device-RNG mismatch that caused false negatives when v0 ran on CPU and v1 on CUDA (or vice versa).

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