Per-turn overrides for CodexAxonConnection.send: everything
turn/start accepts beyond the thread id and input (model, effort,
sandboxPolicy, approvalPolicy, …). collaborationMode is an experimental
app-server field absent from the generated TurnStartParams; using
it requires initializing with capabilities { experimentalApi: true }.
Per-turn overrides for CodexAxonConnection.send: everything
turn/startaccepts beyond the thread id and input (model, effort, sandboxPolicy, approvalPolicy, …).collaborationModeis an experimental app-server field absent from the generated TurnStartParams; using it requires initializing with capabilities{ experimentalApi: true }.