V4.15.5 (In Progress)

This document is in progress. The final release may contain additional changes.

🚀 New Features

1. Added Cloudflare R2 object storage support, including the R2 S3 API, presigned access, and custom domains for public buckets.

⚙️ Improvements

1. Centralized more workspace dependency versions in the pnpm catalog and refreshed the lockfile.
2. Added Chinese and English runtime fonts to the Agent Sandbox image to improve font availability for text and image-related tasks.
3. Updated the OSS adapter to support string uploads required by the IStorage contract and to preserve the stored Content-Type when OSS does not support response-header overrides.
4. Added a missing-object preflight to the COS adapter so downloads follow the shared error contract.

🐛 Fixes

1. Fixed Alibaba Cloud OSS metadata reads that looked for ETags in the wrong response field, causing missing ETags and downstream metadata validation failures.

🛠️ Code Improvements

1. Added cross-provider S3 SDK integration tests for MinIO, AWS S3, Cloudflare R2, Alibaba Cloud OSS, and Tencent Cloud COS, covering private/public buckets, public URLs, and real presigned URL access.