fix(ci): declare pythonpath so the root benchmarks package resolves

CI caught what the local run could not. Both packages' test suites import
`benchmarks.serving_scenarios` (the shared three-way parity fixtures), which
lives at the repo root. That resolved locally only because `python -m pytest`
puts the current directory on sys.path; CI runs the `pytest` console script,
which does not, so collection failed on two modules.

Declare it instead of relying on the invocation: pythonpath = ["."] at the
workspace root, ["../.."] in each package so a package-local `pytest` works
too.

Verified with CI's exact command, `uv run pytest -q`: 835 passed, 13 xfailed.
Each package also gates on its own -- confit 250+1, sql-transform 585+12,
which sums to the same 848.

Author: ahrzb

packages/confit/pyproject.toml

@@ -23,4 +23,7 @@ features = ["pyo3/extension-module"]
 
 [tool.pytest.ini_options]
 python_files = ["*_test.py", "test_*.py"]
+# The repo-root `benchmarks` package carries the shared serving-scenario
+# parity fixtures used by these tests.
+pythonpath = ["../.."]
 testpaths = ["tests"]

packages/sql-transform/pyproject.toml

@@ -29,4 +29,7 @@ features = ["pyo3/extension-module"]
 
 [tool.pytest.ini_options]
 python_files = ["*_test.py", "test_*.py"]
+# The repo-root `benchmarks` package carries the shared serving-scenario
+# parity fixtures used by these tests.
+pythonpath = ["../.."]
 testpaths = ["tests", "sql_transform"]

pyproject.toml

@@ -48,6 +48,11 @@ known-third-party = ["datafusion", "duckdb"]
 
 [tool.pytest.ini_options]
 python_files = ["*_test.py", "test_*.py"]
+# `benchmarks/` lives at the repo root and is imported by both packages' test
+# suites (the serving scenarios are the shared parity fixtures). `python -m
+# pytest` would put the cwd on sys.path and hide this; the `pytest` console
+# script does not, so state it.
+pythonpath = ["."]
 # Scope collection: the duckdb/ source clone (reference corpus) carries its own
 # test_*.py scripts that break under our pytest. Every package's tests are
 # listed so `pytest` from the repo root is the whole gate.