feat(provider): IBM bob provider support added

[SunithaGudisagarIBM1]

#248

[SunithaGudisagarIBM1]

@iamtoruk can you take a look at this PR

[SunithaGudisagarIBM1]

Hi @ozymandiashh,
I have already implemented the issue #248 in this PR,
Can you please take this PR as i came with the issue and the implementation as well.
@iamtoruk @ozymandiashh I am interested to contribute to this open-source project, please consider this PR for merging.
Thank you

[AgentSeal]

Thanks for working on this, and for opening the original issue requesting Bob support.

We've been reviewing both this PR and #303 against a real IBM Bob install. A few issues that make this one hard to merge as-is:

• Merge conflicts with current main (provider registry, README, and other files have changed significantly since this branch was created).
• Model fallback lands on cline-auto which is misleading for Bob users -- Bob deliberately hides its model name, so the fallback should be Bob-specific (e.g. ibm-bob-auto), not the generic Cline label.
• Test fixtures fabricate model tags (claude-sonnet-4-6 in api_conversation_history.json) that don't exist in real Bob installs. The real-world case is always no model tag, and that path isn't tested.

PR #303 addresses these points and is closer to merge-ready, so we're going to move forward with that one after validating it against real data.

Appreciate you opening the issue and the implementation effort -- the discovery paths and shared parser reuse in your PR were solid.