Charlie Marsh a8a4f14087 Fix attestation routing during thread startup (#47912) ...

## Why

Thread startup can prewarm the Responses WebSocket before the creating client is registered with the thread, leaving the handshake unable to request attestation from that client.

## What changed

Reserve a thread ID and register the creating connection before starting the thread, including for ephemeral threads. Remove the thread state if startup fails.

## Testing

Extend the attestation round-trip test to cover persistent and ephemeral threads. Handle attestation requests while awaiting `thread/start` and `turn/start` responses, and verify the WebSocket handshake includes the expected `x-oai-attestation` header.

GitOrigin-RevId: 1bdb38bac641253eed58a2431658ab54d93819c5

2026-09-24 18:38:00 +00:00

..

common

Persist thread creator identity in rollouts and SQLite (#47113)

2026-09-21 21:22:01 +00:00

suite

Fix attestation routing during thread startup (#47912)

2026-09-24 18:38:00 +00:00

all.rs

[codex] Use expect in integration tests (#28441)

2026-06-15 21:53:47 -07:00