v0.7.220

What's Changed

• fix(router): re-send a mid-stream 529 that streamed only reasoning (a2a40de)
• revert(llm): drop per-message identity caches (4199ff3)
• release: update version files for v0.7.219, bump to next dev version (86f0145)

Full Changelog: v0.7.219...v0.7.220