Reject invalid Direct-Cypher toString list items - #1434

Closes #1429.

Sidecar tck-gfql PR: graphistry/tck-gfql#104

Summary

• Reject invalid Direct-Cypher toString() list-comprehension item types for list/map literals.
• Add focused lowering regressions for toString([]) and toString({}).
• Coordinate with the same-name tck-gfql branch to update the direct-Cypher contract and promote fixed string/literal rows.
• Update the Cypher surface guard baseline for the intentional +4 lowering.py lines used by the validation helper.

Validation

• PYTHONPATH=/tmp/pyg1411-deps python3 -m pytest -q graphistry/tests/compute/gfql/cypher/test_lowering.py::test_string_cypher_failfast_rejects_invalid_supported_overlap_queries graphistry/tests/compute/gfql/cypher/test_parser.py graphistry/tests/compute/gfql/test_expr_parser.py
  • 203 passed, 4 warnings
• ./bin/ruff.sh graphistry/compute/gfql/cypher/lowering.py graphistry/tests/compute/gfql/cypher/test_lowering.py
• git diff --check
• ./bin/typecheck.sh graphistry/compute/gfql/cypher/lowering.py
• python3 bin/ci_cypher_surface_guard.py
• PYTHONPATH=/tmp/pyg1411-deps:/home/lmeyerov/Work/pygraphistry:/home/lmeyerov/Work/tck-gfql python3 -m pytest -q /home/lmeyerov/Work/tck-gfql/tests/cypher_tck/test_tck_runner.py::test_direct_cypher_xfail_contract /home/lmeyerov/Work/tck-gfql/tests/cypher_tck/test_report.py /home/lmeyerov/Work/tck-gfql/tests/cypher_tck/test_parse_cypher.py /home/lmeyerov/Work/tck-gfql/tests/cypher_tck/test_lane_contracts.py
  • 895 passed
• PYTHONPATH=/tmp/pyg1411-deps PATH=/tmp/pyg1429-bin:$PATH ./bin/test-minimal-lite.sh --ignore=plans --ignore=test_env --ignore=graphistry/tests/test_text_utils.py --ignore=graphistry/tests/test_compute_cluster.py --ignore=graphistry/tests/compute/test_indegrees_after_umap.py --ignore=graphistry/tests/compute/test_let_engine_coercion.py --ignore=graphistry/tests/compute/test_safe_map_series.py --ignore=graphistry/tests/compute/test_call_engine_coercion.py -k 'not cudf and not umap and not dask'
  • 2947 passed, 155 skipped, 244 deselected, 15 xfailed
• DGX ssh dgx-spark, isolated tracked-file snapshot at ~/repos/pygraphistry-1429, docker/test-rapids-official-local.sh, PROFILE=gfql, WITH_GPU=1, WITH_IMAGE_BUILD=0, focused GFQL parser/row-pipeline/cuDF/cugraph/[META-split] Direct-Cypher wrong-rows tranche D: string/type-conversion cleanup #1429 failfast set:
  • RAPIDS_VERSION=25.02: graphistry/test-rapids-official:25.02-gfql, nvcr.io/nvidia/rapidsai/base:25.02-cuda12.8-py3.12, 358 passed, 6 warnings, log /tmp/pyg1429-rapids-25.02-gfql.log
  • RAPIDS_VERSION=26.02: graphistry/test-rapids-official:26.02-gfql, nvcr.io/nvidia/rapidsai/base:26.02-cuda12-py3.13, 358 passed, 5 warnings, log /tmp/pyg1429-rapids-26.02-gfql.log