[ai-sdk] ai-sdk streamText and gateway()

[ibolmo]

This appears to have introduced a regression.

with:

const { streamText } = wrapAISDK(ai) as typeof ai;

const runTestAi = wrapTraced(
  async () => {
    console.log("getPromptVersions");
    const promptVersions = await getPromptVersions(
      "c08893e4-d1dd-4947-addf-943992c786c9",
      "80942bae-fc33-4e64-8605-b7c88c5be8b4"
    );

    console.log(promptVersions);

    const prompt = await loadPrompt({
      projectName: "switchboard",
      slug: "ai-task"
    });

    const compiledPrompt = prompt.build(
      {
        criticlevel: "expert",
        movie: "Dune: Part Two film (2024)"
      },
      {
        flavor: "chat"
      }
    );

    const result = streamText({
      // biome-ignore lint/suspicious/noExplicitAny: eeek
      ...(compiledPrompt as any),
      model: gateway("openai/gpt-5-nano")
    });

    return await result.content;
  },
  {
    name: "trigger.test-ai"
  }
);

when executed with 0.4.6, the prompt correctly gets linked however when executed with 0.4.9, the prompt does not get linked

Originally posted by @financialvice in #1021 (comment)