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## Why Client defaults can override the fork destination's model and reasoning effort or trigger a migration prompt for a stale model. ## What changed - Omit implicit model and reasoning effort overrides during CLI fork startup, while preserving explicit launch settings. - Skip the model migration prompt and service tier inference when the fork's model is left for the server to resolve. - Initialize unspecified reasoning effort from the forked session's response. ## Testing Add a startup regression test that changes server defaults after bootstrap and verifies that `thread/fork` proceeds without a migration prompt, model or reasoning effort overrides, an inferred service tier, or a `config/read` request. GitOrigin-RevId: 858f0fe3c72b90bdcaf31b400144d37af5bc6ed7