Test #1219: broaden cross-alias OR topology stress coverage - #1282

Summary

• add Cypher WHERE: static validation gap on row-boolean shapes (OR / NOT / XOR among row predicates) — emergent from #1217 Earley swap #1219 residual topology stress coverage for cross-alias OR behavior
• new cartesian-product shape lock: MATCH (a:A), (b:B) WHERE a.x = 1 OR b.y = 2
• new two-hop fanout shape lock: MATCH (a:A)-->(m:M)-->(b:B) WHERE a.x = 1 OR b.y = 2
• keep this slice test-first/test-only (no runtime or planner behavior changes)

Validation

• python -B -m pytest -q graphistry/tests/compute/gfql/cypher/test_lowering.py -k "cross_alias_or"
• python -B -m pytest -q graphistry/tests/compute/gfql/cypher/test_lowering.py -k "issue_1219_row_boolean_audit or cross_alias_or_returns_correct_union or optional_match_seed_only_projection"
• uv run ruff check graphistry/tests/compute/gfql/cypher/test_lowering.py

Process

• Fresh branch off latest master
• Plan tracked locally in plans/1219-cross-alias-or-stress/plan.md
• Review-skill wave pass planned before merge readiness update