New detailed timing telemetry for message enqueue and turn start

What

When a message is delivered, Claude Code now records frameTiming (a received and an enqueued wall-clock timestamp) on the command.

• The cli_user_message_enqueued telemetry event gains new fields: parse_to_enqueue_ms, dedup_ms, flag_settle_ms, receive_hook_ms, and, when attachments are present, attachments_ms, attachment_count, and inlined_images, plus parked_ms when a park timestamp was recorded.
• A new telemetry event, cli_turn_started, is emitted when a turn is dispatched, including the turn's uuid, the batch size, and enqueue_to_start_ms (the time from when the turn was enqueued to when it actually started), whenever frame timing info is available.

Why

This gives a more detailed breakdown of where time goes between a message arriving and a turn actually starting, which helps diagnose latency in message handling.