Sync OpenAI Tasks guide with upstream callback polling behavior

[Copilot]

The upstream Docs update for openai changed the Tasks API guide to reflect the current callback workflow more accurately. This sync updates the local OpenAI Tasks integration guide so its examples and guidance match the upstream documentation.

• Tasks API retrieval flow

  • Clarifies that callback-mode image requests return a task_id immediately on submission
  • Repositions id as the default lookup key for /openai/tasks
  • Keeps trace_id documented as an optional correlation mechanism rather than the primary flow

• Examples and payloads

  • Updates the Python retrieve example to query by id
  • Revises the end-to-end submit-and-poll example to capture submit["task_id"] and poll with that value
  • Aligns sample response type values and batch examples with the upstream guide

• Guide wording

  • Tightens the request field descriptions to distinguish the recommended path from optional trace-based lookup
  • Adjusts the type/filter descriptions to match the current upstream wording

submit = requests.post(
    f"{API}/openai/images/generations",
    headers=HEADERS,
    json={
        "model": "gpt-image-1",
        "prompt": "a watercolor cat sitting on a desk",
        "callback_url": "https://webhook.site/your-uuid",
    },
).json()

task_id = submit["task_id"]

task = requests.post(
    f"{API}/openai/tasks",
    headers=HEADERS,
    json={"action": "retrieve", "id": task_id},
).json()