Ruslan Nigmatullin a3cccbd8ed [codex] Omit fork turns from thread started notifications (#19093)
## Why

`thread/fork` responses intentionally include copied history so the
caller can render the fork immediately, but `thread/started` is a
lifecycle notification. The v2 `Thread` contract says notifications
should return `turns: []`, and the fork path was reusing the response
thread directly, causing copied turns to be emitted through
`thread/started` as well.

## What Changed

- Route app-server `thread/started` notification construction through a
helper that clears `thread.turns` before sending.
- Keep `thread/fork` responses unchanged so callers still receive copied
history.
- Add persistent and ephemeral fork coverage that asserts
`thread/started` emits an empty `turns` array while the response retains
fork history.

## Testing

- `just fmt`
- `cargo test -p codex-app-server`
a3cccbd8ed · 2026-04-24 12:31:13 -07:00
5,781 Commits
2026-04-24 13:36:05 +02:00
2026-04-14 01:45:41 +00:00
2025-04-16 12:56:08 -04:00
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2026-04-22 11:46:11 +01:00
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