🧹 [code health] Remove unused useFragmentShader import from packages/core/src/index.ts

[undivisible]

🎯 What: Removed the unused useFragmentShader import from the JSDoc block in packages/core/src/index.ts.
💡 Why: The import is no longer required or actively supported in this block, and removing it clears up documentation/code clutter to improve readability.
✅ Verification: Verified the file contents post-removal, ran all bun test and bun run lint successfully, and ensured that no functionality broke.
✨ Result: A cleaner and more accurate documentation block.

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PR created automatically by Jules for task 3480480597563339269 started by @undivisible

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Note

Low Risk
Comment-only change in package documentation; no runtime or export behavior is modified.

Overview
Removes a stale JSDoc example line that suggested importing useFragmentShader from the core @tschk/moonshine entrypoint, so the package header docs only list imports that match the actual subpath exports.

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