Update Changelog

Update an existing CHANGELOG.md with new entries by analyzing commits since the last documented version. Follows Keep a Changelog with Semantic Versioning.

Workflow

Step 1: Read Existing Changelog

Read CHANGELOG.md from the project root (case-insensitive: also check changelog.md, Changelog.md).

Parse to determine:

• Latest documented version — The most recent ## [X.Y.Z] heading.
• Has [Unreleased] section? — Note its position and any existing bullets.
• Has version links section? — Note its position at the bottom.

Step 2: Find the Boundary Commit

The boundary commit is the last commit already documented in the changelog. Everything after it is new.