add changeset

Author: adambenhassen

.changeset/fast-dolphins-fly.md

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+'@graphql-hive/cli': minor
+'hive': minor
+---
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+Add v2 storage format for app deployments with delta uploads support. The v2 format uses SHA256 content-addressed hashes enabling cross-version document deduplication - only new documents are uploaded, existing ones are skipped. This can reduce upload times by up to 24x for deployments with mostly unchanged documents.