kyu-delta: GraphDelta, DeltaBatch, upsert fast path.
This crate defines the data model for conflict-free idempotent upserts that bypass OCC for "last write wins" semantics. Designed for KyuGraph's target workloads: agentic code graphs and high-throughput document ingestion.
kyu-delta is a data-model-only crate. The actual application of deltas to storage is done by the executor (kyu-executor) in later phases.