Improve NuGet build: add Source Link, symbols, and deterministic build

[red-gecko27]

Is it possible to update the NuGet build settings to improve package security and integrity?

The current build is missing some recommended options:

• Source Link: not configured
• Symbols: not included (.snupkg missing)
• Deterministic build: disabled

Enabling these would make the package more secure, verifiable, and easier to trust.

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