Changes of code not mentioned in docs

[sha-huang]

It seems the addition of tools: list[Any] | None = None to the signature of the complete method under MockProvider is not mentioned in the Day 2 docs, which results in unexpected keyword argument 'tools' error:

• Day 1

class MockProvider:
    def complete(self, messages: list[dict[str, str]]) -> ModelResponse:

• Day 2

class MockProvider:
    def complete(
        self,
        messages: list[dict[str, Any]],
        tools: list[Any] | None = None,
    ) -> ModelResponse: