SDK result messages can now report a breakdown of time before the first model request

The SDK is the toolkit for running Claude Code from your own programs. When a run finishes successfully, it sends back a result message. That message used to carry only time_to_request_ms and some frame timings. It can now also carry a more detailed breakdown:

• time_to_request_phases_ms, time split by phase before the first request to the model
• process_turn_index, which turn this is within the process
• time_to_request_cpu_ms, processor time spent
• time_to_request_loop_lag_ms, time lost to delays in Claude Code's internal processing
• time_to_request_major_faults, a count of slow memory accesses that had to go to disk
• turn_start_phases_ms, time split by phase at the start of the turn
• turn_start_control_requests_ms, time spent on control requests at the start of the turn
• api_error, a typed error field

These fields appear in sessions run with CLAUDE_CODE_REMOTE, and on setups that set CLAUDE_CODE_EMIT_STARTUP_TIMING.