fix(ci): skip SIMD benchmark in perf-smoke job

bench_simd.py re-invokes `maturin develop` at runtime to compare
portable vs SIMD builds, which requires an active virtualenv.
CI installs into system Python so maturin develop fails with
"Couldn't find a virtualenv". --skip-simd avoids this; the SIMD
comparison is optional profiling, not a correctness gate.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.github/workflows/ci-python.yml

@@ -151,6 +151,7 @@ jobs:
           python benchmarks/run_perf_contract.py \
             --output-dir perf-contract \
             --skip-talib \
+            --skip-simd \
             --batch-samples 20000 \
             --batch-series 32 \
             --streaming-bars 20000 \