jif e1b9c9457c Preserve parent history by default in full agent forks (#55548) ...

## What changed

Default `features.multi_agent_v2.preserve_fork_prefix` to `true`, so full-history forks retain the parent's model-visible history and append child instructions. Keep `preserve_fork_prefix = false` as an explicit opt-out for instruction filtering, and update the configuration schema documentation.

## Testing

Update coverage to verify inherited prefixes across child and grandchild forks, child instruction ordering after compaction, and explicit filtering opt-outs.

GitOrigin-RevId: f14eae5b924cdeac555d112d0aba3fbbb063b0ea

2026-10-20 11:56:17 +00:00

..

common

Record OAuth provenance and login identity for account tokens (#55397)

2026-10-19 22:21:13 +00:00

suite

Preserve parent history by default in full agent forks (#55548)

2026-10-20 11:56:17 +00:00

all.rs

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

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

prompt_prefix.rs

Add an app-server prompt prefix compatibility test (#51857)

2026-10-07 22:21:33 +00:00