Add IBM Bob as a provider

[anima-regem]

Hey — wanted to throw out the idea of supporting IBM Bob as a provider.

I'm in an enterprise context and Bob is the AI assistant we're actually allowed to use (it runs on watsonx, so there's a clear compliance story). Right now T3 Code just doesn't work for folks in that situation.

It's a real use case — not everyone can use OpenAI/Anthropic in their org. Would love to see it show up in the provider list alongside the others.

Anyone else running into this?