Stream Cloudflare responses without full buffering #108

Description

Convert core streaming responses into native Cloudflare Worker streams so the adapter does not collect the entire response first.

The Cloudflare converter maps chunks and errors into worker::Response::from_stream; runtime contract coverage exercises streaming route dispatch and conversion.

Steps to reproduce

1. Inspect the Body::Stream branch of from_core_response.
2. Inspect the existing Cloudflare runtime contract cases for streaming dispatch and response conversion.

Expected behavior

Core body chunks remain a stream through Cloudflare response conversion.

Impact

This delivers the requested adapter path for large and progressive response bodies.

Proposed fix

Close as completed. Broader lifecycle, cancellation and deployed-provider qualification belong to #436 / #275 rather than reopening this basic stream-adoption scope.

Done when

• The converter adopts Body::Stream without collecting it.
• Chunk errors are mapped into Worker errors.
• Cloudflare runtime contracts cover streaming response dispatch/conversion.

Related

• Parent: Complete streaming and compression across adapters #107.
• Broader HTTP/lifecycle qualification: Implement portable outbound HTTP and request lifecycle contracts #436.
• Cloudflare stream adoption
• Cloudflare streaming contracts

The requested implementation is present on the audited main revision. This audit inspected source and existing coverage; it did not rerun the tests.