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.
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