KOS2 release notes live in CHANGELOG.md.
KOS2 uses the YY.MM.X versioning scheme:
YY— last two digits of the year (e.g.26for 2026)MM— month number, no leading zero (e.g.4for April)X— release counter for that month, starting at1
Example: 26.4.8 is the eighth release shipped in April 2026.
The first KOS2 release on this scheme was 26.4.1. Everything before that comes from the upstream obsidian-copilot history and is preserved in docs/release/upstream-archive.md.