Update .NET connect sample: rename script, pin packages to major versions

[Copilot]

Updates the sole .NET sample (001-connect-passwordless) to use a wildcard major-version pin for Microsoft.Azure.Cosmos, add the missing Newtonsoft.Json dependency, and rename the script from Program.cs to connect.cs.

Changes

• Renamed Program.cs → connect.cs
• Package updates in script header directives:
  • Microsoft.Azure.Cosmos@3.47.0 → Microsoft.Azure.Cosmos@3.*
  • Added Newtonsoft.Json@13.* (required for successful build)
• Updated inline error message and readme.md shell commands to reference connect.cs

-#:package Microsoft.Azure.Cosmos@3.47.0
+#:package Microsoft.Azure.Cosmos@3.*
+#:package Newtonsoft.Json@13.*

[Copilot]

Pull request overview

Updates the .NET passwordless connectivity sample to reference the correct entrypoint file (connect.cs) in both documentation and the runtime configuration error message.

Changes:

• Fix README commands to use connect.cs for dotnet user-secrets and dotnet run
• Update the COSMOS_ENDPOINT configuration error message to reference connect.cs
• Adjust script package references (Cosmos version floating + add Newtonsoft.Json)

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
dotnet/001-connect-passwordless/readme.md	Updates run/setup commands to reference connect.cs instead of Program.cs.
dotnet/001-connect-passwordless/connect.cs	Updates package directives and aligns the user-secrets guidance in the exception message.

Comments suppressed due to low confidence (2)

dotnet/001-connect-passwordless/connect.cs:3

• Using a floating NuGet version (Microsoft.Azure.Cosmos@3.*) makes this sample non-reproducible and can silently break over time as new 3.x releases ship. Consider pinning to a specific tested version (or at least a specific minor like 3.47.*) to keep the instructions stable.
  dotnet/001-connect-passwordless/connect.cs:4
• Newtonsoft.Json@13.* is added but nothing in this file references Newtonsoft.Json types. If Cosmos SDK needs it, the dependency should flow transitively; otherwise this extra package increases restore time and introduces additional version drift—please remove it or add a brief comment explaining why it must be a direct dependency for this file-based app.

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