fix: add idempotency pre-checks for 4 DDL operators#17
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Non-transactional DDL operators (createCollection, dropIndex, createView, renameCollection) now check MongoDB state before executing, making multi-step changes retry-safe. A new DatabaseInspector utility provides collection and index existence checks. 12 new integration tests cover idempotent skip paths and genuine conflict scenarios. ANALYSIS.md updated to reflect 9/11 operations now idempotent.
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Non-transactional DDL operators (createCollection, dropIndex,
createView, renameCollection) now check MongoDB state before executing,
making multi-step changes retry-safe. A new DatabaseInspector utility
provides collection and index existence checks. 12 new integration
tests cover idempotent skip paths and genuine conflict scenarios.
ANALYSIS.md updated to reflect 9/11 operations now idempotent.