[Partner Nodes] fix(GPT Image): handle mismatched image sizes returned when size="auto"

[bigcat88]

GPT Image with size="auto" can return images whose sizes differ by a few pixels within one response, which crashed the batch return at torch.stack; resize them to the first image's dimensions before stacking

API Node PR Checklist

Scope

• Is API Node Change

Pricing & Billing

• Need pricing update
• No pricing update

If Need pricing update:

• Metronome rate cards updated
• Auto‑billing tests updated and passing

QA

• QA done
• QA not required

Comms

• Informed Kosinkadink

[coderabbitai]

📝 Walkthrough

Walkthrough

This PR enhances the validate_and_cast_response function in comfy_api_nodes/nodes_openai.py to handle OpenAI image responses where returned images may have slightly different pixel dimensions. The change adds a common_upscale import, updates the function's docstring to document the output as a batched tensor with shape (N, H, W, C), and introduces logic that compares each returned image tensor's height and width against the first image's dimensions, upscaling mismatched images before batch stacking.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and specifically describes the main change: handling mismatched image sizes in GPT Image responses when using size="auto" mode.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description check	✅ Passed	The pull request description clearly explains the issue (GPT Image with size='auto' returning images with mismatched pixel dimensions) and the solution (resizing images to the first image's dimensions before stacking).

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