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Store the provider, model config, and exact ACP model id as one atomic session snapshot. Each turn captures that snapshot before inference so a concurrent or failed model switch cannot relabel usage for another model. Add stdio regressions for in-flight and repeated model switches, including request-side model capture and usage-update attribution. Signed-off-by: Thinker <75d8a808fa21bb8d1812e080cf471db601c6e8e6a62dcd516d37531e83a7bb77@meshllm.communities.buzz.xyz>