Add storage-fsx-windows-sla-optimizer skill - #72

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4, actions/setup-python@v5, actions/upload-artifact@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

missing directory `skills/storage-fsx-windows-sla-optimizer/evals/functional/` — See the "Eval Results Layout" section of CONTRIBUTING.md for the expected evals/ layout.

missing directory `skills/storage-fsx-windows-sla-optimizer/evals/best-practices/` — See the "Eval Results Layout" section of CONTRIBUTING.md for the expected evals/ layout.

missing directory `skills/storage-fsx-windows-sla-optimizer/evals/structure/` — See the "Eval Results Layout" section of CONTRIBUTING.md for the expected evals/ layout.