chore: remove benchmark marker so tests run in CI

Remove @pytest.mark.benchmark so the read throughput tests are included
in the default `make test` filter as parametrize-marked tests.

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

Author: sumedhsakdeo

tests/benchmark/test_read_benchmark.py

@@ -22,7 +22,7 @@
 Memory is measured using pa.total_allocated_bytes() which tracks PyArrow's C++
 memory pool (Arrow buffers, Parquet decompression), not Python heap allocations.
 
-Run with: uv run pytest tests/benchmark/test_read_benchmark.py -v -s -m benchmark
+Run with: uv run pytest tests/benchmark/test_read_benchmark.py -v -s
 """
 
 import gc
@@ -84,7 +84,6 @@ def benchmark_table(tmp_path_factory: pytest.TempPathFactory) -> Table:
     return table
 
 
-@pytest.mark.benchmark
 @pytest.mark.parametrize(
     "streaming,concurrent_files,batch_size",
     [