Bundled `Microsoft.Data.SqlClient` runtime files for Norn's built-in
`sqlserver-windows` adapter.

Why this exists:
- `sqlserver-windows` runs through PowerShell on Windows.
- The modern SQL Server connection-string keywords such as
  `HostNameInCertificate` and `Encrypt=Mandatory` are supported by
  `Microsoft.Data.SqlClient`, not by the older `System.Data.SqlClient`
  provider that ships with Windows PowerShell.
- Bundling the runtime keeps the feature zero-install for Norn users.

Contents:
- `windows-netfx/`
  .NET Framework / Windows PowerShell runtime payload used by the
  integrated-auth adapter.

Bundled package set:
- `Microsoft.Data.SqlClient` `5.2.2`
- `Microsoft.Data.SqlClient.SNI` `5.2.0`
- transitive runtime dependencies resolved from those packages

Licensing:
- These files are third-party runtime assets from Microsoft NuGet
  packages.
- See the bundled license files in `windows-netfx/`.
