Enable Claude Opus 4.6 Full Context Window Choice

Claude Opus 4.6 can technically handle up to a million tokens, but we haven't actually turned that on in Sudowrite yet. Right now it's capped at the same limits as Opus 4.5.

We’d need to update some code to enable it, and it would get way pricier since a multiplier is gonna be added once you go past the base context window.

1. understand that if you blow past that window you double the rates

2. I'd like to be able to blow past that window...

3. One could prevent public access to plugins that turn on this blow past it feature... So one would have to be determined to set this up for oneself.