v0.4.1

Changes

55f8988 release: prepare himalaya-kit 0.4.1
4f59cf7 feat(yearly-archive): add --month YYYY-MM for incremental yearly archive
2bc4d17 docs: add user and Agent integration guides
88d109e ci: upgrade artifact actions to Node 24

Full Changelog: v0.4.0...v0.4.1