Approval card shows Python repr for list arguments that contain objects #90

The confirm_write approval card renders each tool argument through summarize_args in agent/write_confirmation.py. A top-level object becomes compact JSON and a top-level boolean becomes Yes or No, but items inside a list go through str(). A list of objects therefore shows Python's repr on the card.

Steps to reproduce

from write_confirmation import summarize_args

summarize_args({"pages": [{"title": "Q3 plan"}], "flags": [True, False]})

Expected result

[{'label': 'Pages', 'value': '{"title": "Q3 plan"}'}, {'label': 'Flags', 'value': 'Yes, No'}]

Actual result

[{'label': 'Pages', 'value': "{'title': 'Q3 plan'}"}, {'label': 'Flags', 'value': 'True, False'}]

This affects any write whose arguments include a list of objects, for example the pages argument when creating Notion pages or the links of a Linear issue. The approver sees Python syntax where the rest of the card uses JSON and Yes/No.