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Calico IPAM CNI plugin

This directory is the canonical home of the Calico IPAM CNI plugin binary entry point, IPAM lock acquisition, and annotation handling.

Architecture, invariants, and review criteria live in the cross-component IPAM design:

• Index: design/ipam/DESIGN.md
• CNI plugin: design/ipam/ipam-cni.md
• Core library: design/ipam/ipam-core-library.md

Update the design under design/ipam/, not this file. This file is a discoverability pointer.