core: overlap diff root discovery with world state#30286
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Why
Remote diff-root discovery is independent of world-state construction, but it ran afterward and added filesystem metadata latency before the first model request. Overlap the independent work so thread-cold turns do not pay those waits serially.
What
record_context_updates_and_set_reference_context_itemandturn_diff_display_rootswithtokio::join!.TurnDiffTracker; no cache or behavior lifecycle changes are introduced.Validation
A synthetic executor-skill benchmark with artificial network delay: thread-cold model-request p50 improved from about 1.79 s to 1.58 s.