feat: Phase 3f — end-to-end integration test + TempDirectory lifetime fix#6356

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g-talbot wants to merge 7 commits intogtt/parquet-merge-pipeline-3defrom

gtt/parquet-merge-pipeline-3f

Commits on Apr 30, 2026

feat: add end-to-end integration test for Parquet merge pipeline (Phase 3f)

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claude
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fix: thread ParquetWriterConfig through pipeline, fix misleading retry comment

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fix: add fetch_immature_parquet_splits for pipeline respawn, thread writer_config

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feat: add MergeStatistics tracking to ParquetMergePipeline

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refactor: extract shared score_merge() function for scheduler

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docs: add missing why-comments across all merge pipeline files

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feat: wire ParquetIndexingConfig and ParquetMergePolicyConfig to pipeline

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claude
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