sponsors: add ZephyrCloudIO (00), Omar McIver (5), alistairheath ()

Author: Michael-A-Kuykendall

SPONSORS.md

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+# These amazing people make Shimmy possible ���
+
+## Infrastructure Partners ($500+/month)
+*Your logo could be here*
+
+## Corporate Backers ($100+/month)
+**Thank you to our $100/month sponsor!** ���
+- Anonymous Corporate Supporter (joined December 25th, 2025)
+
+## Individual Heroes ($5+/month)
+**Thank you to our $5/month sponsor!** ☕
+- Anonymous Coffee Hero
+
+---
+
+**Want to support Shimmy?** [Become a sponsor](https://github.com/sponsors/Michael-A-Kuykendall)
+
+Shimmy is free forever, but your sponsorship helps me:
+- Fix bugs faster
+- Add new features
+- Maintain compatibility with new models
+- Keep the project alive and thriving