Add dedicated create-story workflow for PRs to main

[Copilot]

The existing e2e-tests.yml runs all endpoint tests on every PR. A separate, focused workflow is needed that validates createStory() specifically and only triggers on PRs targeting main.

Changes

• create-story-test.mjs — Standalone test script that calls createStory() and asserts all required fields (prompt, title, content, image, temperature) are present in the returned payload. Fails fast with a non-zero exit code on any assertion error.

• .github/workflows/create-story.yml — New workflow triggered exclusively on pull_request to main. Builds the project and runs the dedicated test script using OPENAI_TOKEN from secrets. 5-minute timeout; includes a conclude job for a clear pass signal.

on:
  pull_request:
    branches:
      - main

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Add a test that creates the story</issue_title>
<issue_description>Let's add a custom case that runs the code an verifies that it can create a story. It should be a separate workflow, and it should run on pull requests to main.

</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Add a test that creates the story #20

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