Trace-driven debugging — turn a 4-hour panic into a 20-minute investigation — step 8 of 9

Write bug_report(trace) that returns a dict with:

• total_turns: integer, length of the trace
• distinct_tools_called: integer, count of unique (tool, args) fingerprints (use frozenset(args.items()) for the args part)
• looping: boolean, True if any window of 3 consecutive turns has identical (tool, args) (your detector from step 03)
• total_tokens: integer, sum of the tokens field across all turns

Two traces run for you. Expected output:

{'total_turns': 4, 'distinct_tools_called': 1, 'looping': True, 'total_tokens': 880}
{'total_turns': 3, 'distinct_tools_called': 3, 'looping': False, 'total_tokens': 540}