Supply WINDOWS.md and CI.md#windows-validation for the links introduced by #4758. Apply its reviewed platform guidance, preserve the gateway example, and include the linked ETW attribution limitation.
Keep the full-validation examples aligned with architecture-specific MXC E2E tasks and immediate exit-code checks.
Closes#4755.
Signed-off-by: Shailendra Singh <shailendras@nvidia.com>
