Summary

• close the remaining temporal canonicalization mismatch in direct-Cypher for historical named-zone datetime parsing
• align comparison parity between named-zone-derived and explicit-offset datetime literals
• add focused regressions for historical Stockholm named-zone canonicalization and equality

Issue

• closes [META-split] Direct-Cypher wrong-rows tranche B: temporal comparison/canonicalization #1406

Testing

• python -m pytest -q graphistry/tests/compute/gfql/cypher/test_temporal_text.py::test_normalize_temporal_constructor_text_uses_neo4j_historical_stockholm_offset 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
• uv run ruff check graphistry/compute/gfql/temporal_text.py graphistry/tests/compute/gfql/cypher/test_temporal_text.py graphistry/tests/compute/gfql/cypher/test_lowering.py
• python -m pytest -q graphistry/tests/compute/gfql/cypher/test_temporal_text.py graphistry/tests/compute/gfql/cypher/test_lowering.py -k "historical_named_zone or parses_datetime_named_zone_literals or supports_datetime_comparison_consistent_with_sort_order or executes_temporal_datetime_constructor_recomputes_named_zone_offset_for_new_date"