Send: accept a ReadableStreamDefaultReader instead of a Uint8Array.
jsStreamReader (new io.ReadCloser) awaits reader.read() Promises via the
channel+FuncOf pattern, feeding chunks directly to the HTTP PUT body.
No js.CopyBytesToGo of the full file.
Receive: openWaitingFile now returns a pull-based ReadableStream backed by
the Go io.ReadCloser (jsReadableStream helper). Each pull call reads up
to 64 KiB and enqueues a Uint8Array chunk; no io.ReadAll.
jsFileOps.OpenReader: JS now returns a ReadableStream instead of a
Uint8Array; Go wraps it in jsStreamReader for streaming delivery.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
codinget
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