Changelog from Diff

Read the actual diff/commits, not the commit messages (they lie). Group into: Added · Changed · Fixed · Removed · Security (skip empty groups). Each line: user-facing impact, not implementation. "Fixed login failing for emails with uppercase characters" — not "fixed bug in user lookup".

• Lead with what the user notices. Bury internals.
• Call out breaking changes loudly, with the migration step.
• Link the PR/issue. No marketing fluff. Output: markdown ready to paste. If a change has no user impact, leave it out.