Extract reentry helper ownership from lowering

CHANGELOG.md

@@ -58,6 +58,7 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 
 ### Internal
 - **GFQL / row pipeline frame-operation modularization (#1499)**: Split active row-table creation, empty-frame construction, `rows`, `drop_cols`, `skip`, `limit`, and `distinct` helpers from `graphistry/compute/gfql/row/pipeline.py` into the focused `graphistry.compute.gfql.row.frame_ops` module while preserving the existing `RowPipelineMixin` method surface and behavior.
+- **GFQL / Cypher reentry helper ownership cleanup (#1497)**: Moved bounded-reentry helper ownership out of `graphistry.compute.gfql.cypher.lowering` into `graphistry.compute.gfql.cypher.reentry.lowering_support`, so reentry compile-time modules no longer import private helper families from the monolithic lowering module. No compiler/runtime semantics changed.
 - **GFQL / Cypher reentry compiletime lowering-symbol shim deletion (#1471)**: Removed the broad `globals().update(vars(lowering))` compatibility shim from `graphistry.compute.gfql.cypher.reentry.compiletime`, replacing it with explicit imports for the bounded-reentry compile-time dependencies. Added a split-guard test so future reentry compiletime changes cannot reintroduce a broad lowering symbol-table rebind.
 - **GFQL / Cypher final compat-executor reachability shrink (#1466)**: Audited `_execute_compiled_query_compat_non_union()` reachability after the native physical-dispatch lanes landed, planned projection-level `WITH/RETURN DISTINCT` shapes natively through the logical route, and removed the stale compat-executor wrapper so any residual unplanned feature-gap guard dispatches directly through the canonical chain executor. Updated runtime cutover coverage to assert physical planner route use without depending on the deleted private wrapper.
 - **GFQL / Cypher simple top-level OPTIONAL MATCH native route (#1460)**: Simple input-free top-level `OPTIONAL MATCH` queries now receive a logical `PatternMatch(optional=True)` plan and dispatch through the native same-path physical route instead of the generic compatibility executor. Bounded optional reentry is handled by the optional-reentry native route. Added planner, lowering-route, and runtime cutover regressions covering matched rows and unmatched null-extension while asserting the compat executor is not used.