docs: add varg video prompting guide

[Michailbul]

Summary

• add prompting guide reference for varg video generation

Testing

• npm run preflight (fails: missing script "preflight")

[coderabbitai]

📝 Walkthrough

Walkthrough

new documentation file introducing a 4d prompting framework for varg video generation, covering subject, scene, motion, and cinematic controls with practical examples, character consistency guidelines, and repair strategies for improving prompt results.

Changes

Cohort / File(s)	Summary
varg prompting guide skills/varg-video-generation/references/prompting.md	new doc establishing 4d framework (subject, scene, motion, cinematic), includes prompt templates, tsx code example for asset reuse, character consistency approach, and 4-step repair strategy

Estimated code review effort

🎯 3 (moderate) | ⏱️ ~20 minutes

Poem

🎬 four dimensions of the frame, motion, scene, and cinematic name
subject shines through cinematic light, crafting vids that feel just right
when prompts stumble, repair the way, guide your varg to save the day meow

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	the title clearly and concisely describes the main change—adding documentation for varg video prompting, which matches the file addition.
Description check	✅ Passed	the description is directly related to the changeset, stating the intent to add a prompting guide reference for varg video generation.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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