Add CHANGELOG.md or auto-generate from conventional commits

## Recommendation

### 📋 Add Changelog

No `CHANGELOG.md`, `CHANGES.md`, or `HISTORY.md` found. Users rely on GitHub Releases which exist but aren't a persistent, browseable changelog.

## How to Fix

**Option A:** Create `CHANGELOG.md` manually following [Keep a Changelog](https://keepachangelog.com/) format

**Option B:** Auto-generate from conventional commits using a tool like `conventional-changelog` or integrate into the existing release workflows

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**Category:** Essentials | **Priority:** Recommended | **Effort:** Small
Part of #11022
_Filed by repo-audit skill_

┆Issue is synchronized with this [Notion page](https://www.notion.so/Issue-11072-Add-CHANGELOG-md-or-auto-generate-from-conventional-commits-33e6d73d3650817da842df7b99fe308f) by [Unito](https://www.unito.io)