Parse and Order Event Streams

Hudl receives sports telemetry events from recording and analysis surfaces. Events can arrive out of order, and some events may omit their timestamp attribute. Implement a function that returns the events in playback order.

An event is represented as a dictionary. A timestamp, when present, is a non-negative integer measured in milliseconds. Apply these ordering rules:

1. Events with timestamps come first, ordered by ascending timestamp.
2. Events without a timestamp key come after all timestamped events.
3. Events with equal timestamps, and events without timestamps, retain their original input order.
4. Return the original event dictionaries in a new list. Do not modify the input list or its dictionaries.

Formal Specification

Implement order_telemetry(events), where events is a list of dictionaries and each dictionary contains an event key and may contain a timestamp key. Return a new list containing the same dictionaries in the required order.