docs(ai): weekly changelog draft

- Created CHANGELOG.md with initial entry for S3 multipart upload helper.
- Created releases/draft-20260124.md with release highlights and upgrade notes.

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+### Added
+- Provider-agnostic S3 multipart upload helpers to support large file uploads and bucket management. (PR #1620 by PR0M3TH3AN)

releases/draft-20260124.md

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+# Release Draft - 2026-01-24
+
+## Highlights
+
+### S3 Multipart Upload Support
+We have introduced a new helper module `js/storage/s3-multipart.js` to facilitate reliable uploads of large files to S3-compatible storage providers. This module handles:
+- Multipart upload orchestration (initiate, upload parts, complete/abort).
+- Automatic part sizing calculation.
+- Bucket existence checks and creation (with region support).
+- CORS configuration helper.
+- Intelligent `Cache-Control` header generation based on file type.
+
+This addition paves the way for more robust video upload capabilities directly to object storage.
+
+## Upgrade Notes
+
+No breaking changes or dependency bumps in this release.