jif-oai
3cf6f08da5
## Why Follow-up to #25722. Startup prewarm builds a preview `TurnContext` before the first real turn so it can precompute the initial prompt and tool surface. After the per-thread runtime work landed, that preview path still recomputed multi-agent mode from `model_info` and feature defaults instead of reusing the runtime the session had already resolved from persisted metadata or inheritance. That could leave the prewarmed session primed for a different multi-agent mode than the first real turn, which is especially risky because collaboration tool exposure depends on `turn_context.multi_agent_version`. ## What changed - In the `TurnMultiAgentRuntime::Preview` path, prefer `Session::multi_agent_version()` when it is already known. - Only fall back to `model_info.multi_agent_version` and feature defaults when the session has not resolved a runtime yet. - Keep preview mode read-only: this still avoids storing a runtime during startup prewarm. ## Testing - Not run (small runtime-selection follow-up)
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