python: export exact arrow reader schema#9
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Stack position: Rust PR after #8 (ABA-162).
Exports the Arrow schema used by pyiceberg_core ArrowReader from the scan task/record batch transformer path instead of naively mapping the requested Iceberg schema. Intended to support metadata and partition constant projections without PyArrow C stream schema mismatches.
Validation reported by implementer:
Current status: draft, under Codex red-team review before upstream consideration. Known red-team focus: first-task schema derivation across multi-task scans, public API exposure in record_batch_transformer, empty stream schema behavior.