fix(cypher): admit free-form carried-property bridge refs (#1275)

[lmeyerov]

Summary

• admit free-form bounded reentry shapes where trailing clauses reference carried alias properties (e.g. WHERE c.id = x.id, RETURN x.id)
• wire multi_alias_carries into free-form lowering + ReentryPlan metadata and remove the prior carried-property failfast
• fix reentry WHERE rewrite coverage for structured WhereClause paths (expr_tree=None) so bridge predicates are rewritten instead of leaking unresolved aliases
• convert/add Cypher/GFQL: free-form trailing WHERE bridge refs across carried + fresh aliases #1275 execution tests (including cuDF parity guard)
• add changelog entry

Closes #1275.

Validation

• python -m pytest -q graphistry/tests/compute/gfql/cypher/test_lowering.py -k "intermediate_reentry_match_with_carried_property_bridge_where"
• python -m pytest -q graphistry/tests/compute/gfql/cypher/test_lowering.py -k "intermediate_reentry_match_with_carried_property_bridge_where or simple_freeform_intermediate_reentry_match or freeform_intermediate_reentry_match_with_multi_carried_aliases or freeform_intermediate_reentry_match_with_empty_prefix or freeform_intermediate_reentry_match_on_multi_row_prefix or with_match_reentry_carried_scalar_where or with_match_reentry_where_or_on_carried_and_trailing_alias_props or with_match_reentry_where_xor_on_carried_and_trailing_alias_props or issue_1026_multi_alias_with_optional_match_carries_secondary_property or multi_alias_with_stage_scalar_projection_executes"
• python -m pytest -q graphistry/tests/compute/gfql/cypher/test_lowering.py -k "tck- or with-where3-3 or issue_1273 or 1275"
• uv run ruff check graphistry/compute/gfql/cypher/lowering.py graphistry/tests/compute/gfql/cypher/test_lowering.py

GPU note

• Local run had no cudf; paired cudf test is present/guarded.
• dgx-spark command attempts are captured in plans/issue-1275/plan.md and hit remote environment/path provisioning issues.