Context window is 200k tokens across all available Sonnet models

We should add this information when we set the model to give users some idea of the context window size and also potentially help the AI understand its own context limitations and economize its context usage.

All currently available Sonnet models have the same 200k token context window:
- claude-4-sonnet (active)
- claude-3.7-sonnet
- claude-3.5-sonnet

This is good to know regardless of model choice since we're currently choosing between these three as of June 7, 2025.

The issue does not name a file or entry point. Start by locating the configuration or command that selects the Sonnet model, then determine where model information is presented to users or supplied to the AI. Done means the three listed Sonnet models show their shared 200k-token context window without disrupting model selection.

Written by the indexing model from the issue text.