feat(inspector): display reasoning_content with toggle and hot-reload

[AlexanderDefuria]

1. Show reasoning_content field from assistant messages in the trajectory inspector. The field is already stored in trajectory JSON files but was ignored. Visual reasoning blocks render below the main assistant content with an italic header and darker background. Can be a useful debugging tool to check reasoning output.

2. Additionally, a hot reload button enables user's to “watch” the trajectory output during debugging. This hot-reload updates the file without closing the tool.

New hotkeys:

Key	Action
r	Toggle reasoning blocks on/off
R	Reload trajectory file from disk (preserves current step; clamps if file shrank)

New CLI flag: --reasoning / --no-reasoning (defaults to reasoning)

Files changed

• src/minisweagent/run/utilities/inspector.py
• tests/run/test_inspector.py

Note: If there are any changes to the approach or the tests, I'm happy to iterate! I found this functionality very helpful when debugging a project of mine over the last few weeks. :)