feat(api-nodes): update xAI Grok nodes

[bigcat88]

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 pull request introduces two new Grok video API nodes to the node catalog: GrokVideoReferenceNode and GrokVideoExtendNode. The reference node accepts a prompt with up to 7 reference images along with generation parameters, while the extend node accepts a prompt and input video with validation constraints. Both nodes support uploads to the Grok API and utilize a new pricing extraction function. Additionally, the existing GrokVideoNode has been updated to normalize the model name from "grok-imagine-video-beta" to "grok-imagine-video" before submission. The new nodes are registered in the node catalog for availability.

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'feat(api-nodes): update xAI Grok nodes' directly relates to the main changes, which add new Grok video nodes and update existing ones with new functionality.
Description check	✅ Passed	The description references the PR checklist covering API node changes, pricing updates, QA, and team communication, which are all relevant to this pull request's scope.

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Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@comfy_api_nodes/nodes_grok.py`:
- Around line 694-702: The VideoExtensionRequest currently omits the chosen
model value from model["model"], causing inconsistency with other video nodes;
update the call that constructs VideoExtensionRequest (in the sync_op call using
upload_video_to_comfyapi and VideoExtensionRequest) to include
model=model["model"] when building the request object (or if the extension
endpoint truly doesn't accept a model, remove the DynamicCombo that supplies
model["model"]), ensuring the request usage matches
GrokVideoEditNode/GrokVideoReferenceNode patterns.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 656a4f90-fb50-4248-8735-756870e9662e

📥 Commits

Reviewing files that changed from the base of the PR and between 2d5fd3f and 7b43a5e.

⛔ Files ignored due to path filters (1)

• comfy_api_nodes/apis/grok.py is excluded by !comfy_api_nodes/apis/**

📒 Files selected for processing (1)

• comfy_api_nodes/nodes_grok.py