Add Temporal7 temporal comparison regressions - #1442

Closes #1374.

Summary

• add exact Direct-Cypher Temporal7 comparison truth-table regressions for expr-temporal7-{1..5}-{1,2}
• add mixed literal/constructor temporal comparison coverage for date/time/datetime normalization
• add a cuDF temporal comparison smoke that runs when cuDF is available
• add changelog receipt for GFQL/Cypher: temporal wrong-row follow-up (11 remaining, #1353 item #2) #1374/Meta: Prioritized direct-Cypher wrong-row bugfix tranches (92 cases) #1353

Validation

• python3 -m pytest -q graphistry/tests/compute/gfql/cypher/test_temporal_text.py graphistry/tests/compute/gfql/cypher/test_lowering.py -k 'temporal'
• python3 -m pytest -q graphistry/tests/compute/gfql/cypher/test_lowering.py::test_string_cypher_parses_datetime_historical_named_zone_literals graphistry/tests/compute/gfql/cypher/test_lowering.py::test_string_cypher_compares_historical_named_zone_and_explicit_offset_datetime graphistry/tests/compute/gfql/cypher/test_lowering.py::test_string_cypher_temporal7_comparison_truth_table graphistry/tests/compute/gfql/cypher/test_lowering.py::test_string_cypher_temporal_comparison_mixes_literal_and_constructor_forms
• python3 -m pytest -q graphistry/tests/compute/gfql/cypher/test_lowering.py::test_string_cypher_temporal_comparison_truth_table_cudf (skips locally without cuDF)
• PYTHONPATH=/home/lmeyerov/Work/pygraphistry2:/home/lmeyerov/Work/tck-gfql python3 -m pytest -q tests/cypher_tck/test_tck_runner.py -k 'expr-temporal7-1-1 or expr-temporal7-1-2 or expr-temporal7-2-1 or expr-temporal7-2-2 or expr-temporal7-3-1 or expr-temporal7-3-2 or expr-temporal7-4-1 or expr-temporal7-4-2 or expr-temporal7-5-1 or expr-temporal7-5-2'
• ./bin/ruff.sh graphistry/tests/compute/gfql/cypher/test_lowering.py
• git diff --check