feat: add requestoptions.stream in model config

[uinstinct]

Description

Add support for requestOptions.stream in models section in config.yaml

This add supports for using reasoning models of openai using this flag.

example:

models:
  - name: o3
    provider: openai
    model: o3
    apiKey: ${{secrets.OPEN_AI_KEY}}
    roles:
      - chat
      - edit
      - apply
    capabilities:
      - tool_use
    defaultCompletionOptions:
      reasoning: true
    useLegacyCompletionsEndpoint: false
    requestOptions:
      stream: false

closes CON-5285

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Summary by cubic

Adds requestOptions.stream to model config and enforces it in the LLM layer. This lets you turn off streaming for OpenAI reasoning (o-series) models and addresses CON-5285.

• New Features
  • Config schema (types and YAML) now supports requestOptions.stream: boolean.
  • BaseLLM disables streaming when completionOptions.stream or requestOptions.stream is false.
  • Streaming for OpenAI o-series/GPT-5 is only used when not using the legacy completions endpoint.

^{Written for commit ef4cb51. Summary will update on new commits.}

[cubic-dev-ai]

No issues found across 4 files

[RomneyDa]

@uinstinct since stream is already in completion options, how does this impact functionality? I think we should avoid adding a duplicate configuration option.