Batch mutate/1 tier-3 write entry point#48

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Commits on Jun 24, 2026

Design: batch mutate/1 tier-3 entry point

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Design: correct mutate retired-endpoint abort reason to {endpoint_retired, X}

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Plan: batch mutate/1 tier-3 entry point

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Extract add_relationship_in_txn/9 tier-1 primitive

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Add graphdb_mgr:mutate/1 tier-3 batch entry point

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Docs: batch mutate/1 tier-3 entry point

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test: cover explicit-template and per-direction-AVP mutate forms

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