Codex CLI surface harness failed after CLI flag, model, and JSON stream schema drift

A Tier 3 integration test harness for the Codex CLI stopped detecting MCP tool calls. The CLI rejected deprecated unattended flags unless the workspace trust check was bypassed, the harness defaulted to an unsupported model for the current account, and the parser only handled older top-level JSON events rather than the current item.started/item.completed stream with nested mcp_tool_call payloads.