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2fe0b053e9
Add support for S3 custom metadata headers that allow users to attach
key-value pairs to S3 objects.
**Write path**: Accept `metadata: Record<string, string>` in S3Options
- Convert `{ sku: "12345" }` to `x-amz-meta-sku: 12345` headers
- Works with `write()`, `writer()`, and presigned PUT URLs
- Keys are automatically normalized to lowercase per AWS requirements
**Read path**: Return metadata in S3Stats via `stat()`
- Extract x-amz-meta-* headers from response
- Strip prefix and return as `metadata: Record<string, string>`
**Presigned URLs**: Include metadata as signed headers in PUT URLs
- Client uploading to presigned URL must include matching headers
Added `metadata` option to S3Options for attaching custom metadata (x-amz-meta-* headers) to S3 objects during upload. Added `metadata` property to S3Stats returned by `stat()` to retrieve stored metadata. Keys are automatically lowercased per AWS requirements. Maximum ~2KB total metadata supported.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>