TODOs Are Done

We removed the TODOs feature from Amp.

It was very useful when we added it in the middle of last year. It kept the agent on track and gave visual indication of how the work is progressing.

Now, with Opus 4.5, we found it's no longer needed. The agent tracks its own work in a single thread just fine without TODOs. It's faster too, because writing down a list of what it was going to do cost time and tokens. Took up space in the UI, too.

So we removed TODOs - they're done. There's something better coming up.