⚡ refactor(generate-motd): Replace synchronous fs writes with asynchronous ones

[Hackatoan]

💡 What: Replaced the synchronous file write operations fs.writeFileSync with their asynchronous counterpart await fs.promises.writeFile inside the async generateMOTD function.

🎯 Why: Using synchronous file operations (fs.writeFileSync) in Node.js blocks the entire event loop until the write finishes. In an asynchronous context, this harms concurrency and throughput. Transitioning to asynchronous operations ensures the event loop remains unblocked and can process other events or callbacks simultaneously.

📊 Measured Improvement: The execution time of the script itself is very fast (~0.040s to ~0.060s) due to failing fast (the GEMINI API key is missing and it falls back). Replacing synchronous writes with asynchronous promises doesn't drastically improve single-script run time here, but it yields systemic performance benefits: it eliminates event loop blocking which is especially important if this module is run as part of a larger concurrent Node.js process (such as a build step or within a server environment).

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PR created automatically by Jules for task 14745433647990190173 started by @Hackatoan

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