Benjamin Carlsson b707714ae4 Add a native gRPC client for cloud thread resume and attach (#50113) ...

## What changed

Add `codex-cloud-client`, a reusable Rust client for `ThreadService.Resume` and live `ThreadService.Attach` over HTTP/2. Callers supply the native gRPC origin, bearer token, account ID, and `HttpClientFactory`.

- Reuse shared proxy, custom CA, and network policy handling for HTTPS. Reject redirects and allow plaintext HTTP only on direct loopback with unrestricted, unmanaged policy.
- Preserve notification and server-request protobuf payloads as opaque bytes and expose native gRPC status details while redacting credentials, payloads, and error details from diagnostics.
- Bound resume and attach setup to 150 seconds without retrying requests or imposing an idle deadline on live streams. Attach ends on its first error and provides no history or automatic reconnect.
- Select Rustls in `HttpClientBuilder::http2_prior_knowledge()` so HTTPS advertises `h2` through ALPN.

Include a standalone attach example and documentation of admission semantics and stream behavior.

## Testing

Add HTTP/2 fixture tests for protobuf framing, authentication metadata, status trailers, event preservation, malformed responses, stream cancellation, redirect rejection, and diagnostic redaction. Add checks for unsafe origins, network policy restrictions, and TLS `h2` advertisement.

GitOrigin-RevId: 55db70438bb5e59272c6995c67a46ced5fa28ff4

2026-10-01 22:32:29 +00:00

..

attach.rs

Add a native gRPC client for cloud thread resume and attach (#50113)

2026-10-01 22:32:29 +00:00