fix(iceberg): publish merge deletes and append atomically

fix(iceberg): publish merge deletes and append atomicallyphlohouse/phlo #1073 · 2 diagrams

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01 / 04Deletes and appends now run in one transactionPyIceberg stages key deletes and row inserts together, so readers never see half-updated data. wraps inside +20 −18.
02 / 04Schema casting failures now raise immediatelyInvalid column types stop the merge before any deletes or appends stage against the table. rejects mismatched column types in +20 −18.
03 / 04Atomic merge test suites addedTests check that failed staging rolls back completely and successful commits publish once.Tests in +237 −0 and +134 −0 verify .
04 / 04Everything this change touchedThe Iceberg table merge path, atomic staging, schema checks, and end-to-end ingestion tests.

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