Feature: Copilot Local LLM use

[epowers]

Add config runtime provider options:

• str: provider name (default original config schema)
• object:
  • name: str (i.e. "copilot")
  • type: str | None (i.e. "openai", "ollama", "vllm", see copilot provider types for now and think about future types)
  • base_url: str | None (default: os.environ COPILOT_PROVIDER_BASE_URL, OPENAI_BASE_URL, None means api default)
  • api_key: str | None (OPENAI_API_KEY, maybe COPILOT_GITHUB_TOKEN or define a different config var?)
  • etc. support config for Copilot Python SDK provider config and Claude and others

Hack that seems to work but if you have access to Copilot CLI source, you're more capable of a proper implementation:

main...epowers:conductor:feature/local