Upgrade notes

These pages summarize notable API and behavior changes by release. They are curated from CHANGELOG; for exhaustive detail, read the changelog for each version.

Version	Notes
v0.8	Hierarchical chunking, chunk_diff, token budget optimizer
v0.9	Multiformat loaders, dedup, omnichunk eval
v0.10	Chunk store, streaming upsert, MCP serve, OpenTelemetry