fix(ollama): separate thinking content into reasoning_content field

[pawel-twardziak]

What has been done:

• Store Ollama model "thinking" responses in additional_kwargs.reasoning_content instead of mixing with main content
• Preserve additional_kwargs when constructing non-chunk messages from streams
• Add unit test verifying thinking content is properly separated
• Add integration tests ensuring reasoning_content is populated when think=true and absent when think=false
• Fixes issue where thinking tags or content were appearing in the main response content

Fixes #9089

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1 Skipped Deployment

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[pawel-twardziak]

I need to update my branch with main since main has changed in the area of my work

[djholt]

Is this ready/able to be merged?

[pawel-twardziak]

@djholt not yet - I need to align it to the v1 code

[brianneisler]

@pawel-twardziak how can i help you get this across the finish line?

[pawel-twardziak]

@brianneisler You already did it :) Your need motivates me to update this PR! :) Hold my beer bro...

[pawel-twardziak]

@djholt @brianneisler updated
CC @hntrl @sydney-runkle

[ItzCrazyKns]

Hey Langchain team, any updates on when this can be merged?