Update documentation for SpriteAI index.js file

[dev-docs-github-app]

This pull request updates the documentation for the index.js file in the SpriteAI project. The index.js file contains several key functions for generating game assets using AI, including:

1. generateCharacterSpritesheet: Generates a character spritesheet based on a given description and configuration options.
2. fetchAvailableAnimationStates: Returns an array of available animation states for character sprites.
3. fetchAvailableSpriteStyles: Returns an array of available sprite styles.
4. generateEnvironmentSprites: Generates environment sprites based on a given description and configuration options.
5. generateItemSprites: Generates item sprites based on a given description and configuration options.

The updated documentation provides a technical overview of these functions, including their parameters, return values, and dependencies. This will help developers better understand and utilize the SpriteAI functionality in their projects.

[dev-docs-github-app]

This pull request was created by AI Agent. Please review the changes and provide feedback. Context used:

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      "filePath": "docs/spriteai/index-js-technical-brief.md",
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      "filePath": "spriteAI/index.js",
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Name	Status	Preview	Comments	Updated (UTC)
devdocsprod-dev-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 12, 2025 0:38am